Airworthiness directives › 2003-20-05
AD 2003-20-05 Airworthiness Directives; PILATUS Aircraft Ltd. Model PC-7 Airplanes
Makes named: pilatus. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
(c) This AD affects the following airplane models and serial numbers that are: (1) Certificated in any category; and (2) Equipped with forward and aft dihedral fittings, part number (P/N) 111.34.07.469, 111.34.07.470, 111.34.07.471, and P/N 111.34.07.472. Model Manufacturer serial Nos. (MSN) PC-7 101 through 618.
Required actions
(e) To address this problem, you must accomplish the following: Actions Compliance Procedures (1) Accomplish the following inspections: (i) Using Impedance-Plane Eddy-Current inspection procedures, inspect the aft dihedral fittings, P/N 111.34.07.469 and P/N 111.34.07.470, for cracks; and (ii) Using Radiographic inspection procedures, inspect the forward dihedral fittings, P/N 111.34.07.471 and P/N 111.34.07.472, for cracks At whichever of the following occurs later, unless already accomplished: upon the accumulation of 3,000 hours time-in-service (TIS) on the dihedral fittings or 10 years after installation of the dihedral fittings, whichever occurs first; or within 90 days after November 14, 2003 (the effective date of this AD) Inspect in accordance with Pilatus PC-7 Service Bulletin No. 57-006, Revision No. 3, dated January 15, 2003. (2) If a crack is found in any aft dihedral fittings, P/N 111.34.07.469 and/or P/N 111.34.07.470, replace with an improved fitting, P/N 557.10.09.071 and/or P/N 557.10.09.072 (as applicable or FAA-approved equivalent P/N), and modify the spar-cap bolt holes Prior to further flight after the inspection required in paragraph (e)(1) of this AD Modify in accordance with Pilatus PC-7 Service Bulletin No. 57-006, Revision No. 3, dated January 15, 2003. (3) If no cracks are found in any aft dihedral fittings, P/N 111.34.07.469 and P/N 111.34.07.470, modify the fittings and the spar-cap bolt holes Prior to further flight after the inspection required in paragraph (e)(1) of this AD Modify in accordance with Pilatus PC-7 Service Bulletin No. 57-006, Revision No. 3, dated January 15, 2003. (4) If cracks are found in any forward dihedral fittings, P/N 111.34.07.471 and/or P/N 111.34.07.472, replace with a new part Prior to further flight after the inspection required in paragraph (e)(1) of this AD Not applicable. (5) If no cracks are found in any forward dihedral fittings, P/N 111.34.07.471 and P/N 111.34.07.472, no further action is required Not applicable Not applicable. (6) Only install aft dihedral fittings that have a P/N of 557.10.09.071 and P/N 557.10.09.072. You must also accomplish the spar-cap bolt hole modification As of November 14, 2003 (the effective date of this AD) Modify the spar-cap bolt holes in accordance with Pilatus PC-7 Service Bulletin No. 57-006, Revision No. 3, dated January 15, 2003.
Unsafe condition
(d) This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified by this AD are intended to prevent cracks from developing in the forward and aft dihedral fittings, which could result in failure of the wing in certain maneuvers. Such failure could lead to loss of control of the airplane.
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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