The Liver & Gallbladder (Anatomy & Physiology).pptx
22 quad chart
1. 1
Root Cause
Material wear
Historical /Corrective Actions / Path Fwd
Twelve (12) assemblies with improved liners were
provided by NHBB to Bell for evaluation. Two (2) were
successfully bench tested and ten (10) were provided to
the FST and fielded on three (3) aircrafts. FST is tracking
performance.
MR Pitch Link Rod Ends
Reliability Performance Metrics
Inst MTBF = 853 hrs comp / 213 FH AC
Cum MTBF = 979 hrs com / 245 FH AC
(Upper Rod Ends)
Problem Statement
• Reliability performance degrading for MR PL
Rod Ends.
• PMIC interval removal refers to a fatigue life,
sparing needs to be based on current removal
rate.
Main Rotor Controls – For Reference
449-010-44-101
(lower)
449-010-44-103
(Upper)
449-010-435
-101 (Long)
-103 (Short)
Metal to Metal
Contact, 16, 5%
Unknown, 61, 21%
Radial Play Outof
Limits, 220, 74%
2. Copyright 2012 Bell Helicopter Textron Inc.
H1 Drives / Transmissions
Problem Statement
• Reliability Performance
• Leaks
• Gears Grinding Burns
• Main Case Deformation
• TR Driveshaft Couplings
• Water Intrusion
Root Causes
• Seals
• Process – Grinding Wheel Time
• Torsional loads – Quill Webbing
• Paint - Corrosion
Nomenclature MTBUMA (FRACAS) MTBF (FRACAS)
DRIVES/TRANSMISSION SYSTEM 9.963435 43.967993
Data from Aircraft Reliability Prediction Report July 13
DRIVES/TRANSMISSION SYSTEM 8.808477 36.793443
Y
Z
A. Fire Extinguisher
