Airworthiness Directive · Amendment 39-11895 · Kaman Model K-1200 Helicopters
Kaman Model K-1200 Helicopters
Model K-1200 helicopters, with sprag clutch, part number (P/N) K974110-005, installed, certificated in any category.
Note 1: This AD applies to each helicopter identified in the preceding applicability provision, regardless of whether it has been otherwise modified, altered, or repaired in the area subject to the requirements of this AD. For helicopters that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD) for Kaman Model K-1200 helicopters. This action requires replacing certain unairworthy sprag clutches with airworthy sprag clutches. This amendment is prompted by two incidents of sprag clutch failure during external load operations. The actions specified in this AD are intended to prevent a malfunctioning transmission clutch, loss of drive to the main rotor system, and subsequent loss of control of the helicopter.
To prevent a malfunctioning transmission clutch, loss of drive to the main rotor system, and subsequent loss of control of the helicopter, accomplish the following:
(a) Replace each sprag clutch, P/N K974110-005, with a sprag clutch, P/N K974110-003. Sprag clutch, P/N K974110-005, is considered unairworthy.
Note 2: Kaman Aerospace Corporation Service Bulletin No. 090, dated July 13, 2000, pertains to the subject of this AD.
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
