Airworthiness Directive · Amendment 39-8969 · Sikorsky Aircraft Corporation Helicopters
Sikorsky Aircraft Corporation Helicopters
Superseded. A later AD replaced this one: AD 94-14-20 R1. Comply with the one in force.
This AD applies to Sikorsky Aircraft Corporation S-76A Model/Series (all0.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment supersedes an existing airworthiness directive (AD), applicable to Sikorsky Aircraft Model S-76A series helicopters, that currently requires an initial and repetitive inspections of the tail rotor (T/R) blade spar elliptical centering plug (centering plug) for disbonding and adds a retaining pad between the T/R gearbox output shaft and the inboard T/R spar. This amendment requires the same design changes and procedures as the previous AD, except that it would eliminate the 500 hours' time-in-service repetitive inspections for centering plug disbonding. This amendment is prompted by an improved bonding and repair procedure and the lack of reports concerning the movement or disbonding of the centering plug. The actions specified by this AD are intended to prevent the centering plug from disbonding and moving out of position, which could result in loss of tail rotor control, and subsequent loss of control of the helicopter.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
