Airworthiness Directive · Amendment 39-11083 · Sikorsky Aircraft Corporation (Sikorsky) Model S-76C Helicopters
Sikorsky Aircraft Corporation (Sikorsky) Model S-76C Helicopters
Model S-76C helicopters, with Turbomeca Arriel 2S1 engines with an engine Hydromechanical Unit (HMU), part number 0.292.92.822.0, 0.292.92.808.0, 0.292.92.813.0, or 0.292.92.828.0, installed, certificated in any category.
This amendment supersedes an existing priority letter airworthiness directive (AD), applicable to Sikorsky Model S-76C helicopters, that currently requires, before further flight, inserting new operating limitations and performance data into the Rotorcraft Flight Manual (RFM) which require lower allowable gross weights for certain operational conditions. This amendment requires the same actions as the priority letter AD, but updates the previously referenced RFM's. This amendment is prompted by the discovery that the RFM's referenced in the priority letter AD have been revised. The actions specified by this AD are intended to provide the correct RFM references and to prevent an inability to achieve the published One- Engine-Inoperative (OEI) performance 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.
