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 MetricsInst MTBF = 853 hrs comp / 213 FH ACCum 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 Out of 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 36.793443YZ

A. Fire Extinguisher

3

Copyright 2012 Bell Helicopter Textron Inc.

• xx

4

Copyright 2012 Bell Helicopter Textron Inc.

• !!!!

Continue

5

Copyright 2012 Bell Helicopter Textron Inc.

• Kutvlkjn;l

6

Copyright 2012 Bell Helicopter Textron Inc.

• 541981659

• Print Cert