Airworthiness Directive · Amendment 39-9177 · Robinson Helicopter Company Model R22 Helicopters
Robinson Helicopter Company Model R22 Helicopters
Superseded. A later AD replaced this one: AD 99-02-02. Comply with the one in force.
Model R22 helicopters, with forward flexplate (flexplate), part number (P/N) A947-1 with bonded washers, or P/N A193-1 without bonded washers, installed, certificated in any category. Flexplate, P/N A947-1E and subsequent FAA-approved revisions to P/N A947-1, is exempt from the requirements of this AD.
This amendment supersedes an existing airworthiness directive (AD), applicable to Robinson Helicopter Company (RHC) Model R22 helicopters, that currently requires an initial dye penetrant inspection of the main rotor drive forward flexplate (flexplate), and repetitive visual inspections of certain installed flexplates. This amendment is prompted by three accidents reported by the airworthiness authority of Australia involving failure of the flexplate, located between the main rotor gearbox and clutch assembly. The actions specified by this AD are intended to prevent failure of the flexplate, failure of the main rotor drive system, 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
