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Enhancing Reliability of MR Pitch Link Rod Ends: Addressing Performance Degradation

This document outlines the current reliability challenges facing MR Pitch Link Rod Ends, including performance degradation and failure rates. A comprehensive analysis of material wear, leaks, grinding burns, and main case deformation is provided, alongside corrective actions taken. As part of our initiative, we evaluated improved liners supplied by NHBB, with promising results from bench tests and field evaluations on multiple aircraft. The path forward focuses on enhanced monitoring and addressing root causes to improve operational performance and reliability over time.

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Enhancing Reliability of MR Pitch Link Rod Ends: Addressing Performance Degradation

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  1. MR Pitch Link 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. 449-010-44-103 (Upper) 449-010-435 -101 (Long) -103 (Short) Reliability Performance Metrics Inst MTBF = 853 hrs comp / 213 FH AC Cum MTBF = 979 hrs com / 245 FH AC (Upper Rod Ends) 449-010-44-101 (lower) • 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. • Root Cause • Material wear

  2. H1 Drives / Transmissions • Problem Statement • Reliability Performance • Leaks • Gears Grinding Burns • Main Case Deformation • TR Driveshaft Couplings • Water Intrusion A. Fire Extinguisher YZ Data from Aircraft Reliability Prediction Report July 13 • Root Causes • Seals • Process – Grinding Wheel Time • Torsional loads – Quill Webbing • Paint - Corrosion

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