Airworthiness Directive · Amendment 39-15621 · Flight controls
Pilatus Aircraft Ltd. Model PC-6 Series Airplanes
This AD applies to Models PC-6, PC-6-H1, PC-6-H2, PC-6/350, PC-6/350-H1, PC-6/350-H2, PC-6/A, PC-6/A-H1, PC-6/A-H2, PC-6/B-H2, PC-6/B1-H2, PC-6/B2-H2, PC-6/B2-H4, PC-6/C-H2, and PC-6/C1-H2 airplanes, manufacturer serial numbers (MSN) MSN 101 through MSN 999 and MSN 2001 through MSN 2092, certificated in any category, with mechanically operated flaps and leaf springs, part number (P/N) 6232.0175.01 installed in the overhead flap-operating mechanism.
Note: These airplanes may also be identified as Fairchild Republic Company PC-6 airplanes, Fairchild Heli Porter PC-6 airplanes, or Fairchild-Hiller Corporation PC-6 airplanes.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions:
(1) Before the next flight after the effective date of this AD, do a visual inspection of the leaf springs installed in the overhead flap-operating mechanism for cracks following Pilatus Aircraft Ltd. Pilatus PC-6 Service Bulletin No. 27-002, dated July 2, 2008.
(2) If any cracks are found in the leaf springs installed in the overhead flap-operating mechanism, before further flight, remove the three leaf springs, P/N 6232.0175.01, installed in the overhead flap-operating mechanism, and replace with three new leaf springs, P/N 116.45.06.040, in the overhead flap-operating mechanism following Pilatus Aircraft Ltd. Pilatus PC-6 Service Bulletin No. 27-003, dated July 2, 2008.
(3) Repetitively inspect thereafter at intervals not to exceed 25 hours time-in-service following Pilatus Aircraft Ltd. Pilatus PC-6 Service Bulletin No. 27-002, dated July 2, 2008, until the modification required in paragraph (f)(2) of this AD is done. If any cracks are found in the leaf springs installed in the overhead flap-operating mechanism, before further flight, remove the three leaf springs, P/N 6232.0175.01, and replace with three new leaf springs, P/N 116.45.06.040, following Pilatus Aircraft Ltd. Pilatus PC-6 Service Bulletin No. 27-003, dated July 2, 2008.
(4) As of the effective date of this AD, do not install any P/N 6232.0175.01 leaf spring in the overhead flap-operating mechanism.
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.
