Airworthiness directives › 99-17-01
AD 99-17-01 Airworthiness Directives; Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes
Makes named: pilatus. Models named: PC-12, PC-12/45. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Models PC-12 and PC-12/45 airplanes, manufacturer serial number (MSN) 101 through 239, certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
Compliance
Required as indicated in the body of this AD, unless already accomplished. To prevent the flap drive shafts from corroding to the point where the flexible shafts in the flap drive system rupture, which could result in the inability to utilize the flap system with reduced airplane control, accomplish the following: (a) Within the next 4 calendar months after the effective date of this AD, accomplish the following in accordance with the Accomplishment Instructions section of Pilatus Service Bulletin No. 27-003, dated March 8, 1999: (1) Replace all flap drive shafts with flap drive shafts of improved design (part numbers as specified in paragraphs (b)(1) and (b)(2) of this AD); (2) Install additional gaskets on the power drive unit; and (3) Modify the attachment and supporting hardware. (b) As of the effective date of this AD, no person may install, on any affected airplane, a flap drive shaft assembly that is not of the following part numbers (or FAA-approved equivalent part numbers): (1) Part number 945.02.02.201: Flap Drive Shaft 953D100-5 (Inboard); and (2) Part-number 945.02.02.202: Flap Drive Shaft 953D100-7 (Outboard). Note 2: The FAA recommends that the owner/operator of the affected airplanes insert Pilatus Temporary Revision No. 27-07, dated January 8, 1999, into the PC12 Maintenance Manual at the same time this AD is accomplished to assure that the maintenance procedures for the improved design parts are current. (c) Special flight permits may be issued in accordance with Secs. 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (d) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Small Airplane Directorate, 1201 Walnut, suite 900, Kansas City, Missouri 64106. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Small Airplane Directorate. Note 3: Information concerning the existence of approved alternative methods of [[Page 44114]] compliance with this AD, if any, may be obtained from the Small Airplane Directorate. (e) Questions or technical information related to Pilatus Service Bulletin No: 27-003, dated March 8, 1999, should be directed to Pilatus Aircraft Ltd., Customer Liaison Manager, CH-6371 Stans, Switzerland; telephone: +41 41 619 63 19; facsimile: +41 41 610 33 51. This service information may be examined at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. (f) The replacements, installations, and modification required by this AD shall be done in accordance with Pilatus Service Bulletin No: 27-003, dated March 8, 1999. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Pilatus Aircraft Ltd., Customer Liaison Manager, CH-6371 Stans, Switzerland. Copies may be inspected at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC. Note 4: The subject of this AD is addressed in Swiss AD HB 99- 241, dated May 8, 1999. (g) This amendment becomes effective on October 1, 1999. Issued in Kansas City, Missouri, on August 3, 1999. Michael Gallagher, Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-20568 Filed 8-12-99; 8:45 am] BILLING CODE 4910-13-P
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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