Airworthiness Directive · Amendment 39-11860 · Bell Helicopter Textron Canada Model 430 Helicopters
Bell Helicopter Textron Canada Model 430 Helicopters
Model 430 helicopters, serial numbers 49001 through 49018, 49020 through 49043, and 49045 through 49051, 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 (c) 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 Bell Helicopter Textron Canada (BHTC) Model 430 helicopters. This AD requires replacing arm clamp screws (screws) in the yaw, roll, pitch, and collective syncro resolvers, and installing a guard bracket on the yaw, roll, pitch, and collective syncro resolvers. This AD is prompted by an operator's report that a yaw control channel jammed during freedom-of-control checks following maintenance. The actions specified by this AD are intended to prevent a jammed flight control and subsequent loss of control of the helicopter.
To prevent a jammed flight control and subsequent loss of control of the helicopter, accomplish the following:
(a) Remove the arm clamp screws (screws) in the yaw, roll, pitch, and collective syncro resolvers and replace them with airworthy screws in accordance with the Accomplishment Instructions in Alert Service Bulletin 430-99-11, dated May 7, 1999 (ASB).
(b) Install a guard bracket on the yaw, roll, pitch, and collective syncro resolvers in accordance with the Accomplishment Instructions in the ASB.
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.
