Airworthiness directives › 2021-24-01
AD 2021-24-01 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes
Makes named: pilatus. Models named: PC-12/45, PC-12/47, PC-12/47E. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Pilatus Aircraft Ltd. (Pilatus) Model PC-12/45, PC-12/47, and PC-12/47E airplanes, all serial numbers, certificated in any category, with a Spectre Lift Platform System installed in accordance with Supplemental Type Certificate No. SA00634DE.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 10 hours time-in-service (TIS) after the effective date of this AD and thereafter at intervals not to exceed 150 hours TIS, inspect the fuselage strakes for movement (outside inspection), the strakes and their attachment brackets for loose and missing bolts and screws and structural deformation (inside and outside inspection), and the strake attachment brackets and surrounding structure for discoloration, deformation, cracks, and other structural damage (inside inspection) by following the Accomplishment Instructions—Aircraft, steps A through B.(3) and C.(1) through C.(5), in Pilatus Service Bulletin PC-12 Series, Report Number 12-1700-64-0000, Revision B, dated August 10, 2018. (1) You must accomplish the inside fuselage inspection regardless of the results of the outside fuselage inspection. (2) If any movement of the strakes, a loose or missing bolt or screw, discoloration, deformation, a crack, or other structural damage is found during any of the inspections, before further flight, repair using FAA-approved procedures.
Unsafe condition
This AD was prompted by a report of the strake attachment brackets and surrounding structure failing at the upper most bracket bolt hole. The FAA is issuing this AD to detect and address any looseness or damage to the strake, attachment brackets, or surrounding structure, and missing fasteners or loose bolts, which could result in airplane flutter and reduced lateral stability, which may lead to loss of control of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1