Bell CAMO 407 sent

BELL
HELICOPTER
PRAGUE
MAINTENANCE
PROGRAM BELL 407
…
Operator ______
M.A. Subpart G Organization: BELL HELICOPTER PRAGUE
Operator ______
Document
Code:
ISSUE
Revision
Signature:
Prepared by:
APPROVAL:

MAINTENANCE PROGRAM BELL 407
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Issue # SD5-1.2/1 Page 2 of 56
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0 Preface
0.1 MP Distribution list
DISTRIBUTION LIST
No.: RECIPIENT: FORM:
0 BELL HELICOPTER PRAGUE
CAMO
hardcopy
1 Operator/Owner electronic
2 CAA of _________ hardcopy
0 This Maintenance Program (MP) and its revisions is prepared by BELL HELICOPTER
PRAGUE CAMO CZ.MG.XXX and signed on the cover page.
1 After approval, sufficient copies will be made and distributed to each MP holder by BELL
HELICOPTER PRAGUE CAMO.
2 Upon receipt of a revision, each MP holder shall be responsible for inserting the revised pages
in its MP.
3 A List of Effective Pages shall also be issued with each revision to each MP holder, so that
each MP copy can be checked and kept current.
4 MP holders shall thoroughly understand the content of the MP.
5 MP base language is English.

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0.2 Record Of Revisions
LIST OF REVISIONS
REV No.: Revision Date: Incorporated by: Affected pages:
Issue 1,
Revision 0
1.11.2015. CAM All, new document

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0.3 List of Effective Pages
Section Page Issue # Date Altered Section Page Issue #
Date
Altered
0 3 1 6.9.2016 2.4 26 1 6.9.2016
0.1 3 1 6.9.2016 2.4.1 26 1 6.9.2016
0.2 4 1 6.9.2016 2.4.2 26 1 6.9.2016
0.3 5 1 6.9.2016 2.4.3 26 1 6.9.2016
0.4 7 1 6.9.2016 2.4.4 26 1 6.9.2016
0.5 8 1 6.9.2016 3 28 1 6.9.2016
0.6 10 1 6.9.2016 3.1 28 1 6.9.2016
0.7 12 1 6.9.2016 3.1.1 28 1 6.9.2016
0.8 13 1 6.9.2016 3.1.2 32 1 6.9.2016
0.9 15 1 6.9.2016 3.1.3 32 1 6.9.2016
1 18 1 6.9.2016 3.1.4 32 1 6.9.2016
1.1 18 1 6.9.2016 3.2 40 1 6.9.2016
1.2 18 1 6.9.2016 3.2.1 40 1 6.9.2016
1.3 18 1 6.9.2016 3.2.2 40 1 6.9.2016
1.4 19 1 6.9.2016 3.2.3 40 1 6.9.2016
1.5 20 1 6.9.2016 3.3 41 1 6.9.2016
2 22 1 6.9.2016 3.3.1 41 1 6.9.2016
2.1 22 1 6.9.2016 3.3.2 42 1 6.9.2016
2.2 23 1 6.9.2016 3.3.3 42 1 6.9.2016
2.2.1 23 1 6.9.2016 3.3.4 43 1 6.9.2016
2.2.2 23 1 6.9.2016 3.4 45 1 6.9.2016
2.3 24 1 6.9.2016 3.4.1 45 1 6.9.2016
2.3.1 24 1 6.9.2016 3.4.2 46 1 6.9.2016
2.3.2 24 1 6.9.2016 3.4.3 47 1 6.9.2016
2.3.3 24 1 6.9.2016 3.5 49 1 6.9.2016
2.3.4 25 1 6.9.2016 3.5.1 49 1 6.9.2016
2.3.5 25 1 6.9.2016 3.6 50 1 6.9.2016
2.3.6 25 1 6.9.2016 3.7 50 1 6.9.2016
2.4 26 1 6.9.2016 3.8 55 1 6.9.2016
APPROV ED BY:
CAA of
PRAGUE

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0.4 Record Of Temporary Revisions
LIST OF TEMPORARY REVISIONS
TEMP REV No.: Date: Affected pages:
Incorporated by
(SIGNATURE):

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0.5 Table of Contents
0 Preface......................................................................................................................... 3
0.1 MP Distributionlist...............................................................................................................................3
0.2 Record Of Revisions..............................................................................................................................4
0.3 List of Effective Pages..........................................................................................................................5
0.4 Record Of Temporary Revisions...................................................................................................7
0.5 Table ofContents ...................................................................................................................................8
0.6 Information about Helicopter.....................................................................................................10
0.7 Maintenance Statement...................................................................................................................12
0.8 Definitions...............................................................................................................................................13
0.9 Abbreviations........................................................................................................................................15
1 General......................................................................................................................18
1.1 About..........................................................................................................................................................18
1.2 Safety..........................................................................................................................................................18
1.3 Anticipated Utilization.....................................................................................................................18
1.4 Maintenance Program Amendments.......................................................................................19
1.5 Permitted Variations to Maintenance Periods..................................................................20
2 Maintenance Procedures .....................................................................................22
2.1 Maintenance Data Reference.......................................................................................................22
2.2 General......................................................................................................................................................23
2.2.1 General Note.....................................................................................................................................23
2.2.2 Maintenance Records...................................................................................................................23
2.3 ScheduledMaintenance..................................................................................................................24
2.3.1 Preflight Check................................................................................................................................24
2.3.2 Scheduled Inspections .................................................................................................................24
2.3.3 Servicing.............................................................................................................................................24
2.3.4 Corrosion Prevention Program and Storage Program ..................................................25
2.3.5 Time Controlled Items .................................................................................................................25
2.3.6 Repetitive Maintenance (Modifications, AD/SB, Repairs) ...........................................25
2.4 Non-scheduled Maintenance........................................................................................................26
2.4.1 Non-scheduled inspections by AD’s and SB’s....................................................................26
2.4.2 Conditional Inspections...............................................................................................................26
2.4.3 Special Inspections........................................................................................................................26
2.4.4 Check Flight......................................................................................................................................26
3 Appendixes...............................................................................................................28
3.1 Maintenance...........................................................................................................................................28
3.1.1 Scheduled Maintenance...............................................................................................................28
3.1.2 Scheduled Engine Inspections..................................................................................................32
3.1.3 Special Unscheduled Engine Inspections.............................................................................32
3.1.4 Special Maintenance Requirements.......................................................................................32
3.2 Maintenance Tasks from Modifications, Repairs, AD/SB............................................40
3.2.1 Special Inspections Derived from STCs ................................................................................40
3.2.2 Special Inspections Derived from AD/SBs ..........................................................................40
3.2.3 Special Inspections Derived from Repairs ..........................................................................40
3.3 Servicing...................................................................................................................................................41
3.3.1 Scheduled Inspections Derived from Repairs....................................................................41

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3.3.2 Oil System Servicing......................................................................................................................42
3.3.3 Hydraulic System Servicing.......................................................................................................42
3.3.4 Grease Lubrication.........................................................................................................................43
3.4 Corrosion Prevention and Control Programs (CPCP) & Storage Programs......45
3.4.1 Corrosion Prevention and Control Program ......................................................................45
3.4.2 Helicopter Storage .........................................................................................................................46
3.4.3 Engine Preservation......................................................................................................................47
3.5 TimeControlled Items (Engine).................................................................................................49
3.5.1 Engine..................................................................................................................................................49
3.6 Check Flight............................................................................................................................................50
3.7 Pre-check Flight...................................................................................................................................50
3.8 Summaryof Changes (Revisions Highlights)......................................................................55

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0.6 Information about Helicopter
Helicopter Manufacturer
Helicopter Model
EASA TCDS No.
Transport Canada TCDS No.
Ser. No.
Reg. No.
Date of Manufacture
Engine Type
Engine Ser. No
Name of M.A. Subpart G
approved organization
Address of M.A. Subpart G
approved organization
Name of operator
Address of operator
Contact Person
E-Mail
Phone

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0.7 Maintenance Statement
This maintenance program has been prepared in accordance with M.A.302 and annex 1 to AMC
M.A.302 and M.B.301(b).
In the preparation of this Maintenance Program to meet the requirements of EASA Part M, the
current recommendations made by the airframe constructors and engine and equipment
manufacturers have been evaluated and, where appropriate, incorporated.
This Maintenance Program lists the tasks and identifies the practices and procedures, which form
the basis for the scheduled maintenance of the helicopter. The operator undertakes to ensure
that this helicopter will continue to be maintained in accordance with this program. The data
contained in this program will be reviewed for continued validity at least annually in the light of
operating experience.
Amendments (revisions) to the approved maintenance program should be made by the BELL
HELICOPTER PRAGUE M.A Subpart G approved organization, to reflect changes in the TC
holder’s recommendations, modifications, service experience, or as required by the competent
authority.
It is accepted that this program does not prevent the necessity for complying with any new or
amended regulation published by EASA or the CAA of State of Aircraft Registry from time to time
where these new or amended regulations may override elements of this program.
BELL HELICOPTER PRAGUE M.A Subpart G approved organization may only vary the periods
prescribed by the program with the approval of the competent authority or through a procedure
developed in the maintenance program also approved by the competent authority.
It is understood that compliance with this program alone does not discharge the operator
from ensuring that the program reflects the maintenance needs of the helicopter, such that
continuing safe operation can be assured. It is further understood that the competent authority
reserves the right to suspend, vary or cancel approval of the Maintenance Program if there is
evidence that the requirements of the Maintenance Program are not being followed or if the
required airworthiness standards are not being met or maintained.
Signed: Dated:
CAMO POSTHOLDER

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0.8 Definitions
Aircraft –an airplane, helicopter or airship.
Aircraft component – any assembly/item/component/part of an aircraft up to and
including a complete power plant and/or any operational/ emergency equipment.
Approved standard – a manufacturing/design/maintenance/quality standard approved by
the competent authority.
Bell 407 SERIES MM – BHT-407-Maintenance Manual (current revision) together with
BHT-407- Illustrated Parts Breakdown Manual (current revision).
Authority – PRAGUE Civil Aviation Agency, European Air Safety Agency (EASA) or
whichever agency has the authority over the respective air space (changes when applicable).
Human Factors – principles which apply to aeronautical design, certification, training,
operations and maintenance and which seek safe interface between the human and other
system components by proper consideration of human performance.
Human Performance – human capabilities and limitations, which have an impact on the
safety and efficiency of aeronautical operations.
Inspection – the examination of an aircraft/aircraft component in order to establish
conformity with an approved standard.
Maintenance Organization – the authorization issued to certifying staff by the Part-145
approved maintenance organization and which specifies the fact that they may sign Part-
145.50 certificates of release to service within the limitations stated in such authorization
on behalf of the Part-145 approved maintenance organization.
Maintenance – any one or combination of overhaul, repair, inspection, replacement,
modification or defect rectification of an aircraft/aircraft component.
Maintenance data – any information necessary to ensure that the aircraft or aircraft
component can be maintained in a condition such that airworthiness of the aircraft, or
serviceability of operational and emergency equipment as appropriate, is assured.
Modification – the alteration of an aircraft or aircraft component in conformity with an
approved standard.
Overhaul – the restoration of an aircraft/aircraft component, including an inspection and
replacement parts, that meets an approved standard to extend the operational life.
Pre-flight inspection – the inspection carried out before the flight to ensure that the
aircraft is fit for the intended flight. It does not include defect rectification.
Repair – the restoration of an aircraft/aircraft component to a serviceable condition in
compliance with an approved standard.
Replacement - an item that takes the place of another item that is no longer fit for service.
A satisfactory replacement item may be new or rebuilt, but is still within its service life and
time limits.

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0.9 Abbreviations
A/C
AD
ASB
=
=
=
Aircraft
Airworthiness Directive Alert
Service Bulletin
FM = Flight Manual
ALI = Airworthiness Limitation Items
AM = Accountable Manager
MM = Maintenance Manual
AMO = Approved Maintenance Organization
AMP = Aircraft Maintenance Program
AOG = Aircraft On Ground
ATA = Air Transport Association
ATL = Aircraft Technical Log Book
BHT = BELL HELICOPTER PRAGUE Textron Company
CAA = Civil Aviation Authority of the State
of Aircraft Registry
CAM = Continuing Airworthiness Manager
CAMO = Continuing Airworthiness Management Organization
CCG = Corrosion Control Guide
CD = Compact Disk
CL = Check List
CMM = Component Maintenance Manual
CMR = Certification Maintenance Requirements
CRS = Certificate of Release to Service
CPCP = Corrosion Prevention and Control Program
CS = Certifying Staff
DC = Damage Chart

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EASA = European Aviation Safety Agency
FAA = Federal Aviation Administration
FAL = Fuel Airworthiness Limitations
FH = Flight Hours
FOD = Foreign Object Damage
HIL = Hold Item List
HT = Hard Time (Component)
IPB = Illustrated Parts Catalogue
LLP = Life Limited Part
MRB = Maintenance Review Board
(Document)
MEL = Minimum Equipment List
MOE = Maintenance Organization
Exposition
MPD
MRO
=
=
Maintenance Planning Document
Maintenance & Repair Organization
OEM = Original Equipment Manufacturer
PSE = Principal Structural Element
PF = Preflight check
P/N = Part Number
PIC = Pilot-In-Command
RIN = Retirement Index Number
QA = Quality Assurance
QM = Quality Manager
QSS = Quality Safety and Security
SB = Service Bulletin
SL = Service Letter
SPM = Standard Practices Manual
SRM = Structural Repair Manual
STC = Supplemental Type Certificate

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TB = Technical Bulletin
TCH = Type Certificate Holder
TCDS = Type Certificate Data Sheet
WO = Work Order

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1 General
1.1 About
This MP contains procedures recommended by the manufacturer and instructions for
servicing and maintaining Bell 407 helicopters as well as maintenance and servicing procedures
for the engine and other components.
This MP is derived from latest revision of BHT-407-MM.
The information in this MP is based on data available at the time of publication. It is also
supplemented and kept current by service publications from BELL HELICOPTER PRAGUE
TEXTRON Company and Rolls Royce, so that they have the latest authoritative recommendations
for servicing the BELL 407 helicopter.
Any Status of Service Bulletins issued by BELL HELICOPTER PRAGUE TEXTRON
Company can be followed via the subscription. [Refer to www.bellhelicopter.com for
subscription information.]
For Status of Service Bulletins issued by Rolls Royce refer to https://eportal.pwc.ca to
follow by subscription.
1.2 Safety
Proper service and repair is essential in order to ensure the safe and reliability operation of
helicopter engine and components. The service procedures recommended by BELL
HELICOPTER PRAGUE TEXTRON and Rolls Royce are effective methods for performing service
operations. Some of these service operations require the use of tools specially designed for the
task. These special tools must be used when prompted and as recommended.
It is important to note that most Rolls Royce and BHT publications contain various warnings
and cautions which must be carefully read in order to minimize the risk of personal injury or the
use of improper service methods that may damage the engine and airframe or render it unsafe.
It is also important to understand that these Warnings and Cautions are not all inclusive.
Rolls Royce and BHT could not possibly know, evaluate or advise the service trade of all
conceivable ways in which service might be done or of the possible hazardous consequences
that may be involved. Accordingly, anyone who uses a service procedure must first satisfy
themselves thoroughly that neither their safety nor aircraft safety will be jeopardized by the
service procedure they select.
1.3 Anticipated Utilization
This maintenance program is based on helicopter estimated annual utilization of flight
hours. If anticipated utilization will vary more than 25 % maintenance program should be revised.
Helicopter is not planned for commercial operations. It will be only used by the owner for
private non-commercial flights.

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1.4 Maintenance Program Amendments
Amendments to the MP will be initiated as a result of the analysis of the effectiveness of the
MP as described under BELL HELICOPTER PRAGUE CAMO Part 1, paragraph 1.5 “Analysis of
the Effectiveness of the MP”.
The Maintenance Program shall be reviewed on an interval of 12 months and amended
when deemed necessary based on revision of the manufacturer’s documentation or results
from the analysis of the effectiveness of the MP.
These amendments shall be based on:
- Revisions of the manufacturer’s documents;
- Results from the analysis of the effectiveness of the AMP;
- Revisions and recommendations for change submitted by manufacturer or
contracted AMO.
When new revisions of manufacturer's documents are issued, within 3 months after receipt
of such a revised document, AMP should be amended. In case of safety issues or Airworthiness
Directives (AD), an amendment can be issued sooner.
Amendments are summarized as follows:
a) Changes to AMP that can be indirectly approved by BELL HELICOPTER PRAGUE
CAMO per Temporary revision procedure:
 Changes such as introduction of document reference numbers, manpower
requirements, skill codes, new terminology, interval decreasing, threshold
decreasing, etc.
 Change based upon temporary/revision corresponding change/deletion of task in
Aircraft manuals or Engine Manual.
b) Changes that need direct approval per revision procedure by the competent authority:
 Major regrouping of work packages, redefining of maintenance checks.
 Time limit change for numerous systems initiated due to fleet changes and/or
new group of maintenance tasks.
After completion of temporary amendment of the AMP, revised pages should be sent within
10 calendar days to the competent authority.
In case the competent authority disputes the received amendments it will most likely react
by sending an adequate note disputing received amendments. BELL HELICOPTER PRAGUE
CAMO shall react and immediately withdraw the disputed amendment.
Directly approved AMP revision shall be performed at least once per year when each
temporary revision of the maintenance program is incorporated into the next regular revision
approved by the competent authority.

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1.5 Permitted Variations to Maintenance Periods
Periods prescribed by this MP may vary to a certain level if such a need arises due to
reasons like unforeseen workload peak, components and materials availability, and logistics
issues. A permitted variation should not be understood as a maintenance planning tool, but as
exceptional means for the organization to fly for a limited period of time until the required
maintenance can be performed
Variation guidance can be found in ROLLS ROYCE MM Chapter 05.20.00 Paragraph 4.A
Scheduled Maintenance Checks – General Tolerances and Bell MM Chapter 5-00-00 Paragraph
5-13 Scheduled Inspections – Interval Tolerance.
The maximum variation of a prescribed period is indicated below.
a) Items controlled by flight hours :
+/- 10 %, or up to a maximum of 100 FH whichever is less.
a) Items controlled by calendar time:
+/- 10 % or up to a maximum of 30 calendar days whichever is less.
b) Items controlled by landings
+/- 5 % or up to a maximum of 25 landings whichever is less.
Notes :
 The tolerances can not be applied to the life limited parts, Airworthiness Limitation
tasks or the tasks rendered mandatory by airworthiness directives.
 In the case of items with multiple limits (for example flight hours and calendar items),
the most restrictive limit will be always applicable.
 In any case, the tolerances must be kept exceptional and never concurrent.
 Subsequent interval will be adjusted to re-establish the original schedule
 When an inspection is completed more than 10 % early, subsequent inspections will
be advanced as required in order to not exceed the maximum tolerance.
Extensions of maintenance task time limits without tolerance or longer than the tolerance in
the maintenance program may be obtained only with explicit approval by the competent authority,
received prior to the expiration of the basic limit.

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2 Maintenance Procedures
2.1 Maintenance Data Reference
During compilation of this MP the Maintenance Data listed below are used. These
publications must be referred to for more detailed information about prescribed maintenance
procedures
Airframe:
- BHT-407-MM Volume 1-13 (latest revision)
- CSSD-PSE-87-001, Corrosion Control Guide (latest revision)
- BHT-ALL-SPM, Standard Practice Manual (latest revision)
- BHT-ELEC-SPM, Electrical Standard Practice Manual (latest revision)
- BHT-407-CR&O , Component Repair and Overhaul Manual (latest revision)
- BHT-407-CR&O-V, Component Repair and Overhaul Manual – Vendor Data
(latest revision)
- BHT-407-ASB
- BHT-407-TB
- IL, 407 Series
- BHT-407-FM-1 with supplements
(FMS) Engine:
- Engine Maintenance Manual M250-C47B OMM (latest revision)
- RR Service Bulletins
Other substantiating data supporting compliance with the airworthiness requirements:

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2.2 General
2.2.1 General Note
The inspections requirements for the airframe have been categorized
into: Pre-flight Inspection; Scheduled Inspections; Special Inspections and
Conditional Inspections.
Detailed instruction and information on each Inspection Table is in the
referenced Maintenance Data paragraphs.
Replacement of the components contains the works of removing,
installing and testing. The reasons for replacement are: Life Limits expiration;
damage out of repairable limits; failure of the systems; Manufacturer
instructions (Service Bulletins; Alert Service Bulletins; Service Instruction;
Technical Bulletins; STC) and Aviation Agency information (Airworthiness
Directives).
Detailed instruction for replacement is in the Maintenance Manuals
paragraphs, division into MM Chapters in according to the Airframe
systems.
Corrosion Prevention and Control Program (CPCP) is integrated into
Structural program in accordance with the Corrosion Control Guide (CCG)
CSSD-PSE-87-001 (latest revision).
Operational units(usage parameters)
- "FH" (Flight hours): The total elapsed time from the moment a helicopter's
rotor blades start turning until the moment the helicopter finally comes to rest
at the end of flight and the rotor blades are stopped.
- "LD" (Landing): The approach with skis to ground contact with power off.
- "CY" (Cycle): Enginecycles.
- Calendar time: The elapsed time starts on the day the inspection is
completed, a component is installed, or the rotor is turned for the first time
and ends on the last day of the month that the time limit expires. Calendar
time is continuous. Calendar time does not stop when a component is
removed, or a helicopter in put in storage, etc.
2.2.2 Maintenance Records
All maintenance records will be kept by BELL HELICOPTER PRAGUE CAMO.

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2.3 Scheduled Maintenance
2.3.1 Preflight Check
The pilot in command carries out preflight inspection before the first flight
each day i.a.w BHT- 407-FM-1 Section 2-3 and can be found in appendix
7.
2.3.2 Scheduled Inspections
Scheduled Inspections of Airframe include:
2.3.2.1 150 hour inspection or 12 month inspection
2.3.2.2 300 hour inspection for optional equipment
2.3.2.3 600 hour inspection
2.3.2.4 600 hour or 12 month inspection
2.3.2.5 12 month inspection
2.3.2.8 1200 hour or 24 month inspection
2.3.2.10 **Miscellaneous Inspection**
Scheduled Inspections of Engine include:
For the scope of scheduled inspections see Part 3, Appendix No.1 and No.2 (Rolls Royce
maintenance manual)
2.3.3 Servicing
For scope of servicing see Part 3, Appendix No.3

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2.3.4 Corrosion Prevention Program and Storage Program
For scope of CPCP and helicopter storage program see Part 3, Appendix No.4
2.3.5 Time Controlled Items
For airworthiness limitations schedule, component overhaul schedule for airframe and
engine see Part 3, Appendix No.5
2.3.6 Repetitive Maintenance (Modifications, AD/SB, Repairs)
All modifications and repairs that are incorporated on aircraft are listed in the current
version of aircraft status of modifications and repairs that is a mandatory part of aircraft continuing
airworthiness records.
Repetitive maintenance tasks and repetitive inspection requirements are incorporated in
this MP from maintenance data supporting compliance with the airworthiness requirements. This
data can be in the form of a Supplemental Type Certificate (STC), Instructions for Continuing
Airworthiness (ICA), Operators Manual (OM), Service Bulletin (SB), Structural Repair Manual
(SRM) or similar approved documents.
For the scope of repetitive maintenance tasks derived from modifications and repairs see
Part 3, Appendix 2.

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2.4 Non-scheduled Maintenance
2.4.1 Non-scheduled inspections by AD’s and SB’s
Non-scheduled and non-repetitive SB’s, AD’s are not included in this MP, but are performed
separately and controlled using airframe and engine AD and SB statuses.
Compliance with AD’s is mandatory. EASA AD’s status can be found in the EASA web
page www.easa.eu, FAA AD’s status in the FAA web page www.faa.gov, Transport Canada
AD’s status in the Transport Canada web page www.tc.gc.ca.
Status of Service Bulletins issued by BELL HELICOPTER PRAGUE Textron Company
can be followed by the subscription, refer to www.bellhelicopter.com for subscription
information.
Status of Service Bulletins issued by Rolls Royce can be followed by subscription, refer
to https://eportal.pwc.ca.
Note: SB’s, AD’s which are repetitive in their nature are included in Scheduled Maintenance
section of this MP.
2.4.2 Conditional Inspections
Conditional inspections include inspection requirements for unusual or other specific
conditions or circumstances that might occur. Events that require a conditional inspection include
(but are not limited to) the following:
2.4.2.1 Freewheel Lubrication System - i.a.w BHT-407-MM-1, 5-00-00, PARA
5-26A
2.4.2.2 Hard Landing - i.a.w BHT-407-MM-1, BHT-407-MM-1, 5-00-00, PARA
5-27
2.4.2.3 Sudden Stoppage - Main Rotor i.a.w BHT-407-MM-1, 5-00-00, PARA
5-28
2.4.2.4 Sudden Stoppage - Tail Rotor i.a.w BHT-407-MM-1, 5-00-00, PARA 5-
29
2.4.2.5 Overspeed - Main Rotor i.a.w BHT-407-MM-1, 5-00-00, PARA 5-30
Overtorque - i.a.w. BHT-407-MM-1, 5-00-00, PARA 5-31
2.4.2.6 Engine Compressor Stall or Surge - i.a.w BHT-407-MM-1, 5-00-00,
PARA 5-31A
2.4.2.7 Lightning Strike - i.a.w BHT-407-MM-1, 5-00-00, PARA 5-32
2.4.3 Special Inspections
Before approval the National Aviation Authority requirements will be checked and applied to
this document in regards to the particular aircraft.
2.4.4 Check Flight
For scope of test flight see Part 3, Appendix No.6

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3 Appendices
3.1 Maintenance
The intervals given are the maximum permitted intervals under normal
operation of the helicopter. Do not exceed these intervals unless stated
otherwise. It may be necessary to increase the frequency of these intervals
if the helicopter operates in extreme environmental conditions. Refer to
the specific instructions and figures in BHT-407-MM chapter 12 for servicing
and lubrication procedures.
3.1.1 Scheduled Maintenance
3.1.1.1 300 Hour or 12 Month Inspection
Perform this inspection every 300 hours of operating time or 12 months,
whichever comes first. Refer to BHT-407-MM-1, 5-00-00, PARA 5-18 – 300
HOUR OR 12-MONTH INSPECTION
3.1.1.2 150 Hour Inspection
Perform this inspection every 150 hours of operating time. Refer to BHT-407-
MM-1, 5-00-00, PARA 5-18A – 150 HOUR INSPECTION
Perform this inspection every 300 hours of operation.
Refer to BHT-407-MM-1, 5-00-00, PARA 5-19 – 300 HOUR INSPECTION
Perform this inspection every 600 hours of operation.
Refer to BHT-407-MM-1, 5-00-00, PARA 5-20 – 600 HOUR INSPECTION
3.1.1.6 12 month Inspection
Perform this inspection every 12 months of operation.
Refer to BHT-407-MM-1, 5-00-00, PARA 5-22 – 12 MONTH INSPECTION

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3.1.1.7 24 Month Inspection
Perform this inspection every 24 months of operation,. Refer to BHT-407-
MM-1, 5-00-00, PARA 5-23 – 24 MONTH INSPECTION
Perform this inspection every 1200 hours of operation. Refer to BHT-407-
Perform this inspection every 2500 hours of operation. Refer to BHT-407-
3.1.1.11 Special Inspections
Perform this inspection every according to the instructions in PARAN 5-25 in
BHT-407-MM-1, 5-00-00
3.1.1.12 Special Airframe Inspection
A special inspection is of a temporary nature or occurs at a special interval
that is not consistent with the scheduled inspection. They are accomplished
as required, in accordance with the table on 503 in BTH-407-MM-1

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3.1.2 Scheduled Engine Inspections
3.1.2.1 General
This section contains the minimum Rolls Royce Canada approved engine
maintenance inspection checks (based on flight hours or calendar times
whichever comes first) and intended to coincide with airframe inspection
intervals (not to exceed the listed frequencies).
3.1.2.2 Airworthiness Limitations
The Airworthiness Limitations schedule (Table 3.1.2.1.) summarizes the
mandatory maximum life, in hours, years or by Retirement Index Number
(RIN) of components with a limited airworthiness life. Parts that are not on
the schedule have an unlimited airworthiness life. The inspection limitations
schedule (Table 3.1.2.2.) summarizes the mandatory inspection interval in
hours.
Refer to the engine manufacturer’s publications for the airworthiness
limitations schedule of the engine and components.
3.1.3 Special Unscheduled Engine Inspections
Engine problems that are not normal periodic inspection or normal
maintenance practices, such as foreign object damage (FOD), etc., are listed
in section M250-C47B (Operation and Maintenance) page 619 (72-00-00) of
the Rolls Royce manual.
3.1.4 Special Maintenance Requirements
These special maintenance tasks are tasks that are regulated by National
Aviation Authority requirements. Before approval, the National Aviation Authority
requirements will be checked and applied to this document in regards to the
particular aircraft.

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Table 3.1.2.1 Airworthiness Limitations Schedule

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Table 3.1.2.1 Airworthiness Limitations Schedule (Continued)

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Table 3.1.2.2 Inspection Limitation Intervals

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Table 3.1.3 Special EnginesInspection
OCCURRENCE INTERVAL
Foreign Object Damage ( FOD ) After occurrence
Oil System - Loss of Oil After occurrence
Oil System - Chip Detector Light On After occurrence
Oil System - Oil Filter Impending Bypass
Indication
After occurrence
Oil System - Unusual Oil System Conditions After occurrence
Lightning Strike After occurrence
Engine Immersion in Water After occurrence
Hard Landing After occurrence
Main Rotor Sudden Stoppage After occurrence
Fire Extinguisher Discharge After occurrence
Fuel Pump Filter After occurrence
Oil Filter After occurrence
Extended Use of Restricted Fuel After occurrence
Aircraft Flown through Volcanic Ash or Smoke. After occurrence
Lack of Engine Preservation After occurrence
Overtemperature After occurrence
Overtorque After occurrence
Overspeed After occurrence
Limit Override Switch After occurrence

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3.2 Maintenance Tasks from Modifications, Repairs, AD/SB
3.2.1 Special Inspections Derived from STCs
Before approval the National Aviation Authority requirements will be
checked and applied to this document in regards to the particular
aircraft.
3.2.2 Special Inspections Derived from AD/SBs
3.2.2.1 Airworthiness Directives (AD)
ADs are available on the EASA website and will be checked to
determine if they are airframe serial number specific.
<http://ad.easa.europa.eu/search/simple/result/>
3.2.2.2 Alert Service Bulletines (ASB)
See Table 3.2.6 Recurring inspections derived from ASB
ASBs are available on the Bell website and will be checked if they
are airframe serial number specific.
<http://bellhelicopter.net/#/toc/407/ASB>
3.2.3 Special Inspections Derived from Repairs
Once the make of the particular aircraft is known, these special
inspections derived from repairs will be checked and applied to this
document prior to approval.

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3.3 Servicing
3.3.1 Scheduled Inspections Derived from Repairs
This chapter contains the data required to service the helicopter. Sections
3.3.2, 3.3.3, and 3.3.4, contain the list of the recommended servicing
intervals for oil, hydraulic, and grease lubrication servicing.
For data on the consumable materials, refer to the BHT-ALL-SPM. For
specific information on fuels, oils, and fluids, refer as required to the BHT-
407-FM-1 or BHT-407-MD-1.
3.3.1.1 Airworthiness Directives (AD)
Refer to in BHT-407-MM-1, CHAPTER 12-00-00, PARA 1-17 for
details.

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3.3.2 Oil System Servicing
Refer to in BHT-407-MM-1, CHAPTER 12-00-00, Table number 12-13 for
details.
Table 3.3.2 Oil system servicing
NOTES:
1
Refer to the BHT-407-FM-1 & BHT-407-FM-2 for the approved lubricants.
2
Refer to the PW207D1/D2 Maintenance Manual (P/N 3071602) for
the recommended interval.
3
Do the servicing at the interval that comes first.
4
Replace the oil filter in conjunction with the transmission oil replacement.
3.3.3 Hydraulic System Servicing
Refer to BHT-407-MM-1 CHAPTER 12-00-00, PARA 12-32 for Hydraulic System
Servicing information. Also refer to the BHT-407-FM-1, Section 1 for the approved
hydraulic fluids.

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3.3.4 Grease Lubrication
Refer to in BHT-407-MM-1, CHAPTER 12-00-00, PARA 12-35 for details.
Table 3.3.4 Grease Lubrication Intervals

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3.4 Corrosion Prevention and Control Programs (CPCP) &
Storage Programs
3.4.1 Corrosion Prevention and Control Program
A reliable corrosion control program must take into consideration factors such as
geographical location and specific operational environments, i.e. marine
atmospheres, industrial air pollution, agricultural sprays, corrosive soils, abrasive
dust, and extreme temperatures. Corrosion is a complex problem and subtle
changes in the environment can drastically change the corrosion resistance of a
metal and/or breakdown resistance of the protective finish system. Therefore,
corrosion control must be handled on a day-to-day basis. A specific program must
be established that will assure all areas of the helicopter are checked periodically. In
addition, particular emphasis should be placed on those areas which are known to
receive more frequent damage to protective coatings.
An effective corrosion control program must include;
1. Frequent and proper cleaning.
2. Application and timely reapplication of corrosion preventive compounds (CPC) and
water displacing agents.
3. Early detection and repair of damaged protective coatings.
4. Neutralization of active corrosion, repair of corrosion damage, and reapplication of
protective finishes.
5. Replacement of components which are damaged beyond allowable limits.
There are certain parts and/or surfaces that, according to their location, function, or
configuration, are considered to be more susceptible to loss of corrosion protection
due to damage, wear, and/or other deterioration. The loss of protection and
consequent corrosion must be detected at the earliest possible time and corrective
action initiated.
This section is divided into two parts:
- Visual corrosion inspection guide. This guide covers those surfaces which can
be seen without any disassembly of the helicopter and includes those
areas which are accessible during normal visual inspections.
- 100-hour or 90-day (whichever comesfirst) corrosion inspection guide. This
guide includes those surfaces which are accessible for inspection after
removal of cowling, plates, access doors, and other covers normally
removed for 100-hour or 90-day inspections. It is recommended that
these inspections be performed at any time the surfaces are visible and in
no case should the interval exceed 100 hours or 90 days.

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3.4.1.1 Visual Corrosion Inspection Guide
Refer to BHT Corrosion Control Guide CSSD-PSE-87-001
Chapter 30-20-00 Part 30-7 – Visual Corrosion Inspection Guide
(medium sized helicopters).
3.4.1.2 407 Series 100-Hour OR 90-Day Corrosion Inspection Guide
Refer to BHT Corrosion Control Guide CSSD-PSE-87-001
Chapter 30-20-00 Part 30-8 – 100- Hours And/Or 90-Day Visual
Corrosion Inspection guide (medium sized helicopters).
3.4.2 Helicopter Storage
This section provides preparation procedures to place helicopter in storage
for a period of 6 months or less, and de-preservation procedures to activate
the helicopter after storage. The procedure is divided into four categories of
storage: flyable storage, short term storage, intermediate storage, long
term storage and individual component storage.
Storage of helicopter includes corrosion control (Chapter 3 or CSSD-PSE-
87-001) which consists primarily of preventing moisture from contacting
exposed material surfaces by use of preservatives. Always refer to
applicable Flight Manual for approved fuel, oil and hydraulic fluid
specifications. Refer to applicable Maintenance Manual for servicing
instructions.
Existing environmental conditions and available facilities must be taken into
account when a helicopter is to be placed in storage. A choice of storage
procedures is permissible for short periods of storage. For example, a
choice must be made between flyable storage and short-term storage for
any period of time up to 45 days.
3.4.2.1 Flyable Storage (no time limit)
Flyable storage (no time limit) is the prescribed procedure to
maintain a stored helicopter in an operable condition. If daily use
is impossible or impractical, this procedure will keep the
helicopter in the best possible condition. It requires periodic
attention. Date and type of storage must be recorded in helicopter
records. Refer to BHT-ALL-SPM Chapter 10; 10-3 FLYABLE
STORAGE
3.4.2.2 Short-term Storage (1-45 days)
Short-term storage (1 to 45 days) is used to store a helicopter up
to 45 days with very little attention during storage period. Refer to
BHT-ALL-SPM Chapter 10; 10-8 SHORT-TERM STORAGE
3.4.2.3 Intermediate-term Storage (46-180 days)
Intermediate storage (46 to 180 days) is the type of storage to be
used for helicopters that will be inactive for more than 45 days but
not exceeding 180 days. Refer to BHT-ALL-SPM Chapter 10; 10-
14 INTERMEDIATE STORAGE

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3.4.2.4 Long-term Storage (beyond 180 days)
For storage beyond 180 days renew Intermediate Storage
procedures in accordance with BHT- ALL-SPM Chapter 10
paragraph 10-14 through paragraph 10-19.
3.4.2.5 Component Storage
This portion of the chapter gives the preparation procedures to put
the parts, sub-assemblies, and components in storage for
different lengths of time. The instructions for preservation are also
given. The procedures are divided into four categories of storage:
the parts and sub-assemblies temporary storage (1 to 14 days)
(BHT-ALL-SPM Chapter 10 paragraph 10-24), the parts and
sub-assemblies long-term storage (15 to 180 days) (BHT-
ALL-SPM Chapter 10 paragraph 10-25), component
temporary storage (1 to 180 days) (BHT-ALL-SPM Chapter
10 paragraph 10-26), and component long-term storage (180 to
365 days) (BHT-ALL-SPM Chapter 10 paragraph 10-33).
3.4.3 Engine Preservation
3.4.3.1 General
The procedure to be followed for the preservation of engines in
service depends on the period of inactivity and whether or not the
engine may be rotated during the inactive period. The expected
period of inactivity should be established and reference made to
the Engine Preservation Schedule. The preservation carried out
should be recorded in the engine log book and on tags secured
to the engine.
3.4.3.2 Preservation Schedule
 0 to 7 days - Engine may be left in an inactive state, with no
preservation protection, provided engine is sheltered, humidity is
not excessively high and engine is not subjected to extreme
temperature changes that could produce condensation.
 8 to 28 days - Engine inactive for up to 28 days, requires no
preservation provided all engine openings are sealed off and
relative humidity in engine is maintained at less than 40 percent.
Humidity control is maintained by placing desiccant and humidity
indicator on wooden racks in engine exhaust duct. Suitable
windows must be provided in the exhaust closure to facilitate
observation of humidity indicators.
 29 to 90 days - Engine inactive for a period exceeding 28 days,
but less than 90 days, needs only to have the fuel system
preserved, engine intake and exhaust opening covered, and the
desiccant and humidity indicators installed.
 91 days and over - Engine inactive over 90 days in airframe or

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removed for long term storage in container, must, in addition to
29 and 90 day procedures, have the engine oil drained and
engine oil sprayed on unused accessory drive pads.
Preservation procedures and details that must be followed can be
found in Rolls Royce Maintenance Manual Part No. 3071602

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3.5 Time Controlled Items (Engine)
3.5.1 Engine
Section 3.5.1 Time Controlled Items (Engine) contains approved life limitations for
those engine parts that are life limited.
The engine rotating components listed in Table 3.5.1 and 3.5.2 contain those parts
that are limited according to either their total operating hours or the total number of
cycles, whichever occurs first. Operating hours, with respect to maintenance records,
is defined as the time from the moment the aircraft leaves the surface of the earth
until it touches down at the next point of landing. A cycle is defined as a start or start
attempt. Total cycles are recorded in the electronic control unit as part of the
maintenance history data. Assistance is available for determining total engine cycles
at any given time by connecting the ground maintenance terminal to the aircraft
interface terminal if available.
NOTE: Refer to Table 6, Chapter 72-00-00 for Time Between Overhaul (TBO) limits
on the 250-C47B Series Engine

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Table 3.5.1. PW207D1 Engine Turbine/Turboshaft Rotor Components - Service Life
Nomenclature Part No. Description
Maximum
Operating
Hours
Maximum
Cycles
First-stage
Wheel 23053299 Original 2025 3000
23074361
New
Production
Match
Machined
2025 3000
M250-10226
New Coating
(Alt)
Production
Match
Machined
2025 3000
M250-10227
New Coating
(Alt)
2025 3000
Second-stage
Wheel 23032280 Original 2025 3000
23074362
New
Production
Match
Machined
2025 3000
M250-10658
New
Production
2025 3000
M250-10657
New
Production
2025 3000
3.6 Check Flight
The check flight is a non-commercial flight during which the proper functioning of
the entire aircraft or some of the aircraft systems is checked.
Details on Check Flight procedures are described in BELL HELICOPTER PRAGUE
CAMO Chapter 1.13.
3.7 Pre-check Flight
The pilot is responsible for determining whether the helicopter is in condition for a
safe flight. Refer to Figure 2-1 for preflight check sequence.
Note: A preflight check is not intended to be a detailed mechanical inspection, but
simply a guide to help the pilot check condition of the helicopter. It may be as
comprehensive as conditions warrant at discretion of pilot. All areas checked
shall include a visual check for evidence of corrosion, particularly when a
helicopter is flown near salt water or areas of high industrial emissions.

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3.8 Summary of Changes (Revisions Highlights)
Task Date Description of Change

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