MEL MMEL

1. MASTER MINIMUM EQUIPMENT LIST (MMEL)
and
MINIMUM EQUIPMENT LIST(MEL)
Vishal Rana
180122

2. Contents
 Master minimum equipment List(MMEL).
 MMEL prohibited items.
 Minimum equipment List(MEL).
 MEL Contents.
 MEL intent.
 MEL limitations.
 Differences between MMEL & MEL.
 REFRENCES.

3. Master Minimum Equipment List
 MMEL is a document prepared by a
manufacturer which contains list of
equipments which must be operative for the
dispatch of an aircraft.
 It is attached in the flight manual.

4. MMEL
 Most large aircraft are designed in access of
exceed airworthiness requirements.
 Some equipment is not required for all
operations (eg. lights for day).
 Passenger convenience items.
 Items not included are to be operative.

5. MMEL
 Approved or modified by authority
 Required level of safety must be maintained
 Consequences of
further failure
 Changes in crew
workload
 Degradation in crew efficiency
 Adverse weather conditions

6. MMEL Prohibited Items
 Not to include any item of equipment
which, if inoperative, is likely to
significantly affect performance of the
aircraft unless noted in the AFM and MEL.
 No item shall be included in the MMEL which conflicts
with the limitations or invalidates the emergency
procedures of the AFM or of an airworthiness directive
unless the AFM or directive provide otherwise.
 The MMEL shall not include any part or structural
component of the aircraft which is the subject of the
Configuration Deviation List (CDL).

7. Minimum Equipment List

8. MEL DEFINITION
A minimum equipment list is developed by (or
on behalf of) an aircraft operator based on a
‘Master Minimum Equipment List’ (Master
MEL or MMEL) developed by the aircraft
manufacturer.
The MEL is derived from the MMEL and is
applicable to an individual operator.

9. MEL Content
 The operator's MEL must reflect the current MMEL
limitations unless otherwise authorized by a change in
the MMEL. When a revision is issued to a MMEL, the
operator's MEL need not be revised if the change is less
restrictive than the existing MEL.
 Except as noted above, all items installed in an
operator's aircraft which are addressed in the most
recent approved version of the MMEL, shall be
included in the MEL.

10. MEL INTENT
Operation of an aircraft with
aircraft equipment inoperative
or removed is prohibited
unless an operator does so in
compliance with an approved
MEL.

11. MEL LIMITATION
With the exception of Global
Changes, the content of an
operator's approved MEL cannot be
less restrictive than the content of
the approved MMEL for that
aircraft type.

12. Differences between MMEL vs. MEL
 MMEL is given by the
the aircraft manufacturer.
 MMEL is less
restrictive.
 MMEL is a general one
for all airline operators.
 The main concern of
MMEL is safety.
 MEL is given by the
airline operator.
 MEL is more
restrictive.
 MEL is specific for an
airline.
 MEL takes into
consideration of
safety + airlines.

13. MODIFICATION OF MMELS & MELS
 Operators may request changes to their MEL . These
suggestions for changes, accompanied by appropriate
substantiation, should be forwarded to the DGCA for
assessment.
 The Authority may modify their MMEL where
appropriate, or
 An operator may contact the manufacturer directly
with a request to review the MMEL.

14. ------------------------------------------------------------------------------------------
| FLYRITE AIRLINES |
| R MINIMUM EQUIPMENT LIST |
|----------------------------------------------------------------------------------------|
|AIRCRAFT: |REVISION NO: 07 |PAGE: |
| de Havilland DHC-6, Series 100, 200 | | |
| |DATE: Oct. 18, 1998 |24-1 of 1 |
|----------------------------------------------------------------------------------------|
| 1. | 2. NUMBER INSTALLED |
| SYSTEM & RIC | ----------------------------------------------------------|
| SEQUENCE | | 3. NUMBER REQUIRED FOR DISPATCH |
| NUMBERS | | ----------------------------------------------------|
|--------------------------| | | 4. REMARKS OR EXCEPTIONS |
|24 ELECTRICAL POWER | | | |
| | | | |
|1 L GENERATOR and B |2 |1 |(O) Provided the corresponding loadmeter |
| R GENERATOR | | | operates normally. |
| Caution Lights | | | |
| | | | |
|2 A.C. Inverters B |2 |1 | One may be inoperative for day VMC. |
| | | | |
| B |2 |1 |(M) One may be inoperative for day or night |
| | | | provided flight instruments do not require |
| | | | A.C. power. |
| | | | |
| | | | |
| | | | |
| | | | |
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| | | | |
| | | | |
| | | | |
MEL
NOTE, The other equipment listed on the
MMEL is not fitted to Flyrite Aircraft

15. EXAMPLES OF THE
DHC6 MMEL
CONVERTED INTO AN
MEL

16. ------------------------------------------------------------------------------------------
| TRANSPORT CANADA |
| MASTER MINIMUM EQUIPMENT LIST |
|----------------------------------------------------------------------------------------|
|AIRCRAFT: |REVISION NO: 07 |PAGE: |
| de Havilland DHC-6, Series 100, 200 & 300 |DATE: Sep. 18, 1998 |23-1 of 2 |
| |
|----------------------------------------------------------------------------------------|
| 1. | 2. NUMBER INSTALLED |
| SYSTEM & RIC | ----------------------------------------------------------|
| SEQUENCE | | 3. NUMBER REQUIRED FOR DISPATCH |
| NUMBERS | | ----------------------------------------------------|
|--------------------------| | | 4. REMARKS OR EXCEPTIONS |
|23 COMMUNICATIONS | | | |
| | | | |
|1 Communications D |- |- | Any in excess of those required by |
| Systems (VHF, | | | regulation and not powered by a standby or |
| HF, UHF) | | | emergency bus may be inoperative. |
| | | | |
|2 Passenger B |1 |0 |(O) May be inoperative provided: |
| Address System | | | a) alternate procedures are established |
| | | | and used, and |
| | | | b) required safety briefings are given to |
| | | | passengers using a means that will |
| | | | ensure the briefings are audible to |
| | | | each passenger. |
| All cargo D |1 |0 | |
| operation. | | | |
|3 Static C |- |- | One may be missing from the rudder and one |
| Discharge Wicks | | | from the right elevator. |
| | | | |
|4 Cockpit Speakers D |- |0 | May be inoperative provided headsets are |
|*** | | | installed and used by each person on |
| | | | flight deck duty. |
| | | | |
|5 Headsets and D |- |- | Only those in excess of those required for |
| Microphones | | | each flight deck crew member may be |
| | | | inoperative. |
| | | | |
|6 Pre-recorded D |- |0 |(O) Provided alternate procedures are |
| Passenger | | | established and used. |
|*** Announcement | | | |
4. REMARKS OR EXCEPTIONS
|23 COMMUNICATIONS | | |
| | | |
|1 VHF Comm Systems B | 2 | 1 | (o)Number two VHF may be unserviceable
| | | | provided number one VHF and the HF is
| | | | operative.
|2 HF Comm Systems D | 1 | 0 | May be unserviceable provided both
| | | |VHF are operative and VHF communications
| | | |can be maintained for the duration of the
| | |flight
MMEL - MEL EXAMPLE

17. ------------------------------------------------------------------------------------------
| TRANSPORT CANADA |
| MASTER MINIMUM EQUIPMENT LIST |
|----------------------------------------------------------------------------------------|
|AIRCRAFT: |REVISION NO: 06 |PAGE: |
| de Havilland DHC-6, Series 100, 200 & 300 | | |
| |DATE: Dec. 05, 1997 |22-1 of 1 |
|----------------------------------------------------------------------------------------|
| 1. | 2. NUMBER INSTALLED |
| SYSTEM & RIC | ----------------------------------------------------------|
| SEQUENCE | | 3. NUMBER REQUIRED FOR DISPATCH |
| NUMBERS | | --------------------------------------------------- |
|--------------------------| | | 4. REMARKS OR EXCEPTIONS |
|22 AUTOFLIGHT | | | |
| | | | |
|1 Autopilot C |1 |0 |(M) Provided: |
|*** | | | |
| | | | a) the controls are confirmed free, and |
| | | | |
| | | | b) the system is deactivated and |
| | | | secured. |
| | | | |
|
| D |1 |0 | Provided routine procedures do not require |
| | | | its use. |
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|----------------------------------------------------------------------------------------|
| 1. | 2. NUMBER INSTALLED |
| SYSTEM & RIC | ----------------------------------------------------------|
| SEQUENCE | | 3. NUMBER REQUIRED FOR DISPATCH |
| NUMBERS | | --------------------------------------------------- |
|--------------------------| | | 4. REMARKS OR EXCEPTIONS |
|22 AUTOFLIGHT | | | |
| | | | |
|1 Autopilot C |1 |0 |(M)(O) Provided: |
| | | | a) a qualified captain and co-pilot occupy |
| | | | the pilot positions, and two crew |
| | | operational procedures are available. |
| | | | b) the flight controls are confirmed free, |
| | | | c) the system is deactivated and |
| | | | secured. |
| | | | |
MMEL - MEL EXAMPLE

18. References
 www.wikipedia.com
 www.skybrary.aero
 www.smartcockpit.com
 www.pprune.org

19. Thank You!