Airworthiness Directive · Amendment 39-8834 · Twin Commander Aircraft LLC Airplanes
Twin Commander Aircraft LLC Airplanes
This AD applies to Twin Commander Aircraft LLC 500-S, 500-U, 680-FL(P), 680-W, 681, 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 supersedes Airworthiness Directive (AD) 91-08-09, which currently requires the following on certain Twin Commander Aircraft Corporation (Twin Commander) 500, 680, 681, 685, and 690 series airplanes: repetitively inspecting the wing front spar lower cap (spar cap) for corrosion; and replacing the spar cap if corrosion exceeds certain limits. This action incorporates updated and more detailed inspection procedures, extends the repetitive inspection intervals, and provides the option of incorporating one of three modifications as terminating action for the repetitive inspections. The actions specified by the AD are intended to prevent wing structural damage that, if not detected, could progress to the point of failure.
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
