Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC-12/45 airplanes. This proposed AD would require you to inspect the left and right main landing gear (MLG) assemblies for any part number (P/N) 532.10.12.077 bolts that do not have white primed and painted heads; and replace any bolt found with new P/N 532.10.12.077F bolts in all MLG assemblies. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. We are issuing this proposed AD to detect and correct any P/N 532.10.12.077 bolts that do not have white primed and painted heads, which could result in corrosion of the bolt and consequent failure of the bolt. This failure could lead to MLG collapse during airplane landing and take-off operations with consequent loss of airplane control.