Airworthiness Directive · Amendment 39-11056 · McDonnell Douglas Helicopter Systems Model MD-900 Helicopters
McDonnell Douglas Helicopter Systems Model MD-900 Helicopters
McDonnell Douglas Helicopter Systems (MDHS) MD- 900 helicopters, certificated in any category.
This amendment adopts a new airworthiness directive (AD) that is applicable to McDonnell Douglas Helicopter Systems (MDHS) Model MD- 900 helicopters. This action requires establishing or reducing certain life limits, applying serial numbers (S/N's), determining hours time- in-service (TIS), and creating component history cards or equivalent records for various parts. This amendment is prompted by analysis that indicates a need for establishing or reducing life limits to avoid fatigue failure of certain parts. The actions specified by this AD are intended to apply appropriate life limits to various parts.
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.
