69-20-01 PILATUS AIRCRAFT WORKS, INC: Amdt. 39-853. Applies to Model PC- 6 Series Aircraft Serial Numbers 1 through 723 and 2001 through 2050.
Compliance required as indicated unless already accomplished.
To prevent the rudder trim control cable from coming off the pulleys aft of bulkhead 6 (rear cabin wall), accomplish the following:
(a) Within the next 100 hours' time in service, inspect the clearance between the cable keeper and the cable pulleys aft of bulkhead 6 in accordance with Pilatus Service Bulletin No. 92, dated March 1969, or later Swiss Federal Air office approved revision or an FAA approved equivalent.
(b) If the clearance between the keeper and the cable pulleys is found to be greater than .040 inch, replace the old cable keeper, P/N 6201.16, with a redesigned cable keeper, P/N 916.96.06.244 in accordance with Pilatus Service Bulletin No. 92, dated March 1969, or later Swiss Federal Air Office approved revision or an FAA approved equivalent.
This amendment becomes effective October 27, 1969.