AD 75-16-05

75-16-05 PILATUS AIRCRAFT LTD: Amendment 39-2280. Applies to B4-PC11 gliders Serial Numbers up to and including 159, certificated in all categories. Compliance is required as indicated. To detect improper aileron control connecting bolt installation and to prevent aileron jamming accomplish the following: (a) Within the next ten hours' time in service after the effective date of this AD, unless already accomplished, visually inspect the aileron control connecting bolts on the aileron control differential bellcrank to ensure the bolts are oriented correctly in accordance with Pilatus B4-PC11 Operating Manual, Figure 1, Page 26, or an FAA-approved equivalent. (b) Within 25 hours' time in service after the effective date of this AD, unless already accomplished, shorten all bolts P/N 116.35.11.070 used on aileron control differential bellcranks and airbrake control bellcranks, in accordance with the accomplishment instructions contained in Pilatus Aircraft Ltd. Service Bulletin No. 1003 dated June 1974, or an FAA- approved equivalent, or replace with modified or replacement bolts supplied by manufacturer or with equivalent FAA-approved bolts. This amendment becomes effective July 28, 1975.