You know you reviewed a document. You decide you need some leveler, some way to consistently document the Reliability of an item (not just a prediction, various criteria) (from the What's in your Wallet series - Reliability)

1. Global 7000/8000 Program
Reliability Review
Score Dwg No. Rev Dwg Description/Name Engineer
ABC
(12345-101
Shut Off Valve (SOV) Rel Engineer
NHA Dwg No. Rev NHA Dwg Description/Name Prev MTBF: 85,000 Sub-System/LRU Functions
12345 Aircraft Interface Subsystem
Weight Material Coating
MTBF Rqmt
Design Temp -65°F to +275°F
Fluid Temp -40°F to 200°F
Ambient Temp -65°F to 185°F
Operating Temp -65°F to 158°F
1.77 lbs 7075, 304 CRES,
15-5 PH
Anodized 110,000 100,000 FM Note: The SOV must be located as close as
possible to the Dual Brake Control Valve (BCV) in
order to minimize "Water Hammer" effects
Section No. Ltr Questions/Criteria Yes/No Dwg Impact
(Y/N)
Remarks Hyd Conn: 3 ea, Spec (8/16)
CYL Port : Wrenching Flats: 1"
PRESS port : Wrenching Flats: 1"
RET port: Wrenching Flats: 1"
A Part Type/Info
1 Identify the Part Type Additional Info (material, AC/DC, etc) Three-way, two position, single coil, normally
closed design. A pilot-operated design is used to
lower current rqmts.
An ilet filter is used for contamination control.
a Mechancial Yes 3 hyd ports, spool valve (CYL, PRESS, RET)
NOP: 3200 psig
Proof: 4800 psig
Burst: 8000 psig
The Shutoff Valve functions as a hydraulic
Switch. When electrically actuated, the Shutoff
valve provides full hyd pressure to the Brake
Control Valve (BCV). When de-energized, the
SOV does not allow pressure to the BCV.
A Check Valve (CV) is incorporated into the RET
port in order to prevent return line pressure
surges from interfering with normal operations.
Both the PRESS abd CYL ports are protected by
bidirectional filters.
Perfromance curves are in PRC00208.
b Electronic Yes 28VDC (16-32 VDC), drop-in/out voltage.
1 elec conn - 2/3 pins used
c Electromechanical Yes Solenoid (diode, coils)
2 Identify the System Description
>>>
B Operation 1 a Does the part work or operate full time? No during taxi, take-off, landing
b Does the part have a duty cycle (part time oper)? Yes full time
2 Is the item a rotating part? No internal valve/flap
3 Does the item move linearly (extend, contract)? No
4 Does the item require electrical power (AC/DC)? Yes +28VDC ('+16 to 32 vdc).See PRC00209, Rev E
5 Does the item require hydraulics or hydraulic fluid to
operate?
Yes NOP: 3200 psig
Proof: 4800 psig
Burst: 8000 psig
6 Does the item have over-current, under/over voltage
protection (fuses, circuit breakers)?
No ~ Lightning Protection ~
7 Does the item require software to operate? Yes SWD - BCU
8 Does the item require scheduled maintenance or servicing
for continual operation? (brake pads, filters, lube/grease,
wear type items, etc)
No
9 Is the item susceptible to EMI, EMP, ESD, ground loops? Yes ~ Lightning Protection ~
10 Does the item require separate or special support (brackets,
isolators, etc), fastening/mounting hardware)
No requires 3 mounting bolts/fasteners
11 Is the item a wire harness or connector (susceptable to
multiple mating cycles, disconnections/connections)?
Yes D38999/21AN98PN
2/3 conn/pins used
12 Is the item susceptable to movement or stretching? No
13 Does the item have to go through a bulkhead, or have
bending radius issue or problem?
No
14 Can the item be used or installed elsewhere (multi-function
item, different functions/applications)?
Yes SOV for Inboard/Outboard Systems
(partial redundancy)
15 Does the item require borescoping, or calibration (Sppt
Eqpt/TMDE?
No
C Configuration 1 a Does the drawing change affect form, fit, or functionality?
b Does the drawing change affect the item application?
c Does the drawing change affect software (interoperability,
application)?
D Parts Control Program 1 a Is the part on the PPL (Preferred Parts List)? No
b Is the part on the QPL Quallified Parts List)? No
c Is the vendor on a Preferred Vendor List? No
2 Does the item require or susceptable to obsolence? No
E Quality 1 a Is the part Screening, or Quality Grade/Level provided? Yes DAL ?
b Is the Part Screening, or Quality Level acceptable or meet
the requirement? (material, coating, forging, cast, extruded,
etc)
- Meets PRC00208, Rev E
2 a Is the Manufacturing Process stated? No
b Is the Manufacturing Process mature or acceptable? Yes
3 a Has ESS or HALT/HASS Testing been performed? No similarity to G650 90006114 (Pnuedraullics)
b Does the ESS or HALT/HASS Testing meet the item
requirements
-
4 a Has the Acceptance Test been performed? Yes
b Does the Acceptance Test meet the item requirements? Yes
5 Does the item have any problems or issues in the FRACAS
or FMECA?
Yes Poor (rejected), Rel Pred & FMEA out of sync,
missing many FM's, poor Effects
6 a Is the item design complex? No
b Does the item meet or exceed the reliability requirements?
(MTBF, failure rate; time/period)
Yes Prev version had lower MTBF (below rqmts)
Unsure. Need better verification of source data from
NPRD95, and missing MIL-STD-217F, Ntc2 elec
part calculations
c Does the item degrade the reliability?
(MTBF, failure rate; time/period)
Yes Life: 20,000 cycles
subject to wear, internal components, seals, o-rings,
solenoid
d Is the item's design mature?
(<1 yr immature), 2-3 yr (early stages),
4-5 yrs (early growth/maturing), 5 yrs + (mature)
Yes some similarity to G650 90006114 (Pnuedraullics)
vs Global - Canyon
e Is the item redundant? Partial Inboard/Outboard functionality
f Is the item fault tolerant (x out-of y items operating,
online/dormant/offline items)
No Need vendor to provide a Similarity Report
F Stress/Environment 1 Is Thermal Management Adequate
a Is heating, cooling, or temperature cycling a problem? No
b Is thermal limiting or thermal shutdown provided? No
c Is forced air or air conditioning needed? No installed in MW bay
d Is cooling using the the Fuel, Lube Oil, or Cooling Systems
needed?
No
2 a Are the material properties adequate for the operation,
vibration, load or intended use?
Yes Need results from Vib Analysis
b Does the item meet the stress and yield requirements? Yes PRC00208, Rev E
c Is the item adequately derated? -
3 a Does the item meet, match, or exceed the Environment
requirements? (temp, humidity, extremes, minimums,
cycling, vibration or shock, etc)
Meet QTO, Ck against PRC0208, Rev E
b Does the item meet, match, or exceed the Aircraft, Vehicle,
or Building/Shelter, etc Environment requirements?
(indoor/outdoor, pressurized, vacuum, radiation, etc)
- Mounted in internally in MW Bay.
* Not pressurized area
G Part
Criticallity/Essentiality
1 a Is the life limited? No
b Does the item have a shelf life? No
c Is the item wear, fatigue, or use limited? Yes
2 a Is the item Flight Critical? Yes Landing, Take-off, taxiing Can not dispatch
b Is the item Flight Essential? -
c Is the item Mission Critical? Yes Landing, Take-off, taxiing
d Is the item Mission Essential? -
3 Is the item a one time use item? No Unsure if throw-away item
Reliability Assessment/Scorecard
Date
date - first review
date - 2nd review
MTTR
File: Sample Rel Assement - A Company -SOV Reliability Assessment Criteria.xls
Tab: APT Page 1 of 2 Pages

2. Global 7000/8000 Program
Reliability Review
File: Sample Rel Assement - A Company -SOV Reliability Assessment Criteria.xls
Tab: APT Page 2 of 2 Pages