The document is a traveler for a shut off valve project that contains comments identifying issues and requested changes to reliability predictions and failure mode and effects analyses documents. Key issues identified include the reliability prediction and FMEA documents being out of sync, missing failure modes, incomplete descriptions, and the FMEA not meeting standard formats. The comments request adding diagrams, separating failure effects, ensuring failure rates match, and addressing additional failure modes.

1. Your Program
Program: Your Program Date HYD Mech Elec Elec-Mech
Document Updating/Developing Update X X
Doc # Re_Pred_12345-101 Rev -
Title: Shut Off Valve (SOV) BCU BTMS ABS Tray
BCV BPT
Part No.# 12345-101 Rev - CV APT
Title: Aircraft Interface for Your Valve PS
X SOV
DPBV NW
Engineer: Joe Engineer RV MW
Rel Eng: Rel Engineer HF BA
ACC
Status SV
Rejected Rel Pred (vendor data) TRV
Rejected FMEA (vendor data) PBH
PBC
Physical CVG
Elec Elec Conn/pins - threaded
Solenoid & diode, actuator
volt current loss of
Input/
Output
Lightning /
Surge
suppression
NW
Mech Body, O-ring/Seal, Hyd Port, Elec
Conn - threads, filter
cracking clogging tear Elec Conn -
threads MW
Hyd Hyd Port housing leaking pressure leaking
Fault
Detection
Visual, BIT
Rev Vendor
Data
1 FMEA12345-101
Rel Prediction
X Govt, Industry
2 FMEA12345-101
FMEA
X Aviation
3 Spec
Your Program, 12345-101 Shut
Off Valve, Specification
X Standards (eg ARP, MIL, etc)
3 Spec 12345-102
Other Program, 12345-102, Shut
Off Valve, Specification
X Customer docs
4 12345-102
Shut Off Valve
X MABS docs
5 Interface Doc 12345-101
Shut Off Valve
Misc
6 Interface document 12345-102
other program, Shut Off Valve
7 Compliance Matrix
Shut Off Valve
8 PPFMEA 12345-101
Shut Off Valve (SOV)
10 12345-103 SOV,
(111-1 ACME)
11 12345-104 SOV,
(111-2 ACME)
12 CDR, Your Company Slides,date
SOV (pg 1-5)
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FMEA - Missing failure modes (use std FM's). Split out, re-think/re-develop Failure Mode Effects (Local, NHA, End).
FMEA - missing details (eg Safety Hazard Severity Code, & Probability. Chg/Update fault Detection and Design Improvement, etc).
Missing information or incomplete (eg front matter, scope, acronym list, summary, description, functions, features, assumptions, methodology, references,
conclusion, remarks, etc).
Rel Prediction - Rel Prediction & FMEA out of sync, hard to follow Ident numbers vs letters. Use same Ident number through out. Provide BOM with Cross section
diagram, with ID's or call-outs labled for better identification. Must also correlate to MPS. Clearly identify components.
ABC Company
Other program PN 12345-102
Shut Off Valve
SOV CDR Slides (ABC Company)
date
ACME Piece Part FMEA (vendor)
Guidance/Direction (MABS, etc)
Piece Part FMEA
Remarks
Rel Prediction & FMEA out of sync, hard to follow Ident numbers vs letters. Provide BOM with Cross section diagram, with ID's labled for better identification.
Missing/Need FBD, RBD, and Input/Output Diagram.
FMEA - although tailored, format does not meet MIL-STD-1629A or ARP 4761 format.
Rel Prediction - description/functions incomplete. Ensure hyd and elec, including inputs/outputs are mentioned. Provide input voltage, and drop-i/out voltages.
Mention default conditions when de-energized, and any features for reliability, safety, and maintainability. Also include NOP, Proof, and Burst Pressure are
mentioned.
Rel Prediction - table needs additional detail, indicate NPRD ID/page. Provide NPRD associated Env variable. If not AUC, then provide Conversion Factor and
adjusted Failure Rate.
FMEA - Rel Prediction & FMEA out of sync, hard to follow Ident numbers vs letters. Use same Ident number through out. Provide BOM with Cross section
diagram, with ID's or call-outs labled for better identification. Must also correlate to MPS. Clearly identify components.
FMEA - Unable to determine actual component vs diagram or graphic . Clearly identify components.
FMEA - add failure modes of Housing, Manifold/body , or other components, include mounting flanges, hyd ports, elec ports, screens/filters, o-rings, etc.
Failure modes should include major/minor cracking - leaking, filters - major/minor clogging or tearing of screens/filters. Major/Minor cracking at hyd or elec conn
threads can result in loss of connection. USe standard FM's for actuator, solenoids, springs, windings, diode. Wear of springs, clips, etc need to be addressed.
(See FMD97)
FMEA - Add FM's for Loss of Input Voltages (+28VDC) and output Current (Input typically 16-32 VDC,include drop-in/out voltages)
FMEA - Add FM's for Valves - Stuck Open/Closed. Ensure sufficient detail are provided solenoid (energized and non-energized), loss of power, diode shorting or
open. Addtionally ensure FM's are provided/address drop-out/drop-out voltages.
FMEA - Add FM's for slow response for valve closing/opening.
FMEA - Detection Method - typically is based upon either either visual inspection, BIT or monitors, None (eg internal leaks, cracks, etc)
FMEA - Separate out Failure Mode Effects (Local, NHA, End Effect vs check mark) NHA and End effect needs to be planned and reviewed iteratively, to determine
proper effects, consolidation of effects, and End Effects. NHA Effects are used to determine FMES.
Rel Prediction - Ensure part description/function provided in Rel Prediction Parts table. If no Part Stress table available, include in Rel Prediction Table. Also
include column for Safety Factors for each component.
FMEA - Hazard Classification (see MIL-STD-1629A and/or ARP 4761). Hazard Codes should be either 1, 2, 3, or 4 for Catastrophic, Hazardous, Major, Minor/No
Effect.
Spec, Shut Off Valve
Source Document(s): Name/Title
Document Review / Traveler
LRU's
Standard Reference Documents
(Typically Added)
Rel Prediction, Shut Off Valve
FMEA, Shut Off Valve
FMEA - Design improvement - relates to the Material and durability of design, and Safety Factor (eg type of material strength exceeds design rqmts, etc.). (eg .
Filters - one can also list additional filters, for connectors - additional threads available/provided
FMEA - Criticallity Number relates to the probability this event can happen (see MIL-STD-1629A and/or ARP 4761).
FMEA - item failure rate should be the same as in Rel Prediction, Failure Mode Rate (FMR) pertains to the various failure modes and allocated failure rate for
each mode (eg see FMD97) . Use FMD97 for standard failur emodes and FMR's.
FMEA - does the electronics have lightning or surge protection, or under/over voltage protection?
Rel Prediction - Include assumptions, methodology, Summary for each section, and Remarks. Use MIL-HDBK-217F, Ntc2 for Electronic components.
Rel Prediction/FMEA - Include all references, guidance documents, and sources of data/information, and list in hierarchical order.
Rel Prediction - Provide Functional Block Diagram (FBD), Reliability Block Diagram (RBD), and Input/Output Diagram - indicating hyd and elec/voltage. Address
accordingly in FMEA.
FMEA - check/add whether FM's …does Valve meet transient opening/close rqmts?
File: Sample Traveler -Shut-Off Valve (SOV) Traveler.xlsx
Tab: SOV