AD 94-17868

Published 1994-08-15 · 8 models · 331 US-registered tails affected · Federal Register

Airworthiness Directives; Schweizer Aircraft Corporation and Hughes Helicopters, Inc. Model 269A, 269A-1, 269B, 269C, and TH-55A Series Helicopters Federal Register ↗

Abstract

This amendment supersedes an existing airworthiness directive (AD), applicable to Schweizer Aircraft Corporation and Hughes Helicopters, Inc. Model 269A, 269A-1, 269B, 269C, and TH-55A series helicopters, that currently requires repetitive inspections and replacement of certain lower belt drive pulley bearings (pulley bearings). This amendment retains the present AD requirements and adds an alternate pulley bearing to the requirements of the AD. This amendment is prompted by the introduction of an alternate pulley bearing into service by Schweizer Aircraft Corporation. The actions specified by this AD are intended to prevent failure of the pulley bearings, loss of power to the rotor systems, and subsequent loss of control of the helicopter.

Applicability · by US fleet size

SCHWEIZER 269C TCDS 4H12 116 tails
HUGHES 269A 98 tails
HUGHES 269C 73 tails
HUGHES 269B 30 tails
HUGHES TH-55A 7 tails
HUGHES 269A-1 5 tails
FRANKLIN A 1 tails
SCHWEIZER 269A TCDS 4H12 1 tails

Compliance instructions

Required actions, compliance times, parts/serial numbers and methods of compliance are in the Federal Register publication — not paraphrased here. Read AD on Federal Register ↗