Airworthiness Directive · Amendment 39-8832 · Twin Commander Aircraft LLC Airplanes
Twin Commander Aircraft LLC Airplanes
This AD applies to Twin Commander Aircraft LLC 685, 690, 690A, 690B.
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) that applies to certain Twin Commander Aircraft Corporation (Twin Commander) Models 685, 690, 690A, and 690B airplanes. This action requires modifying the wing ribs at Wing Station (WS) 39, inspecting (one-time) WS 39 for cracks or corrosion, treating any corrosion found, and replacing any cracked wing front spar lower cap (spar cap). Several reports of cracked spar caps and cracked and deformed wing ribs at WS 39 on the affected airplanes prompted this action. The actions specified by this AD are intended to prevent failure of the wing structure caused by a cracked spar cap or cracked or deformed wing rib at WS 39.
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
