Airworthiness Directive · Amendment 39-9090 · The Boeing Company Airplanes
The Boeing Company Airplanes
This AD applies to The Boeing Company DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), MD-88.
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 adopts a new airworthiness directive (AD), applicable to certain Model DC-9-80 series airplanes and Model MD-88 airplanes, that requires modification of the engine nose cowls. This amendment is prompted by several in-flight incidents in which the engine nose cowl separated or nearly separated from the airplane. The actions specified by this AD are intended to prevent separation of the engine nose cowl from the airplane during severe vibration of the engine.
