Airworthiness Directive · Amendment 39-11549 · Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes
Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes
Models PC-12 and PC-12/45 airplanes, all manufacturer serial numbers (MSN) up to and including MSN 180, certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes 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 (d) 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) that applies to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC- 12/45 airplanes. This AD requires replacing the stick pusher capstan and the stick pusher servo with parts of improved design. The AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified by this AD are intended to prevent improper operation of the stick pusher system caused by the existing design configuration, which could result in loss of control of the airplane during a stall.
To prevent improper operation of the stick pusher system caused by the existing design configuration, which could result in the loss of control of the airplane during a stall, accomplish the following:
(a) Within the next 50 hours time-in-service (TIS) after the effective date of this AD, replace the stick pusher capstan and stick pusher servo with parts of improved design, in accordance with the applicable maintenance manual, as specified in Pilatus Service Bulletin No. 22-003, dated June 24, 1999. The new part numbers (P/N) are as follows:
(1) Stick Pusher Capstan: P/N 978.61.11.124 (or FAA-approved equivalent part number); and
(2) Stick Pusher Servo: P/N 978.61.11.103 (or FAA-approved equivalent part number).
(b) As of the effective date of this AD, no person may install, on any of the affected airplanes, a stick pusher capstan or stick pusher servo that is not of the part number specified in paragraphs (a)(1) and (a)(2) of this AD, respectively.
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.
