Airworthiness Directive · Amendment 39-9425 · Robinson Helicopter Company Helicopters
Robinson Helicopter Company Helicopters
This AD applies to Robinson Helicopter Company R22, R22 ALPHA, R22 BETA, R22 MARINER.
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 Robinson Helicopter Company Model R22 series helicopters, that currently requires an inspection and repetitive visual checks for slippage of the tail rotor (T/R) drive and replacement of the T/R gearbox, if necessary. This amendment requires disassembly of the T/R gearbox to verify the installation of the input and output shaft keys (keys) between the input and output pinions and their respective shafts. This amendment is prompted by two incidents in which the key was not installed between the output shaft and the output pinion during assembly of the T/R gearbox at Robinson Helicopter Company. The actions specified by this AD are intended to prevent slippage of the T/R drive, loss of directional 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
