AD 93-09-12 ACTIVE

93-09-12 FOKKER: Amendment 39-8578. Docket 92-NM-197-AD.
Applicability: Model F27 series airplanes; serial numbers 10102 through 10684, inclusive, 10686, 10687, and 10689 through 10692, inclusive; on which Dowty Rotol main undercarriage upper members, P/N 200463301, 200251300, 200251301, 200567300, or 200680300, are installed; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent failure of the main landing gear (MLG), accomplish the following:

(a) Within 9 months after the effective date of this AD, perform a high frequency eddy current inspection to detect cracks in the upper members of the MLG, in accordance with Fokker Service Bulletin F27/32-162, dated March 8, 1991.

(1) If no crack is found, prior to further flight, mark the upper members in accordance with Fokker Service Bulletin F27/32-162, dated March 8, 1991.

(2) If any crack is found, prior to further flight, replace the cracked uppermember with one that has been inspected and has been found to be free of cracks, or with one that has been reworked, in accordance with the service bulletin.

(b) Within 12,000 landings since the last overhaul, or within 6 months after the effective date of this AD, whichever occurs later, rework upper members of the MLG that have not been reworked previously, in accordance with Fokker Service Bulletin F27/32-162, dated March 8, 1991.

(c) Within 10 days after accomplishing the inspection required by paragraph (a) of this AD, report the finding of any crack that exceeds 0.1 inch (2.54 mm) to Dowty Aerospace Customer Support Center, Service Manager, P.O. Box 49, Sterling, Virginia 20167; or fax (703) 430-4932. Reports must include the extent and location of cracks, the part number or issue number of the cracked upper member, the total number of landings on the cracked upper member, and the total number of landings since overhaul of the cracked upper member. Information collection requirements contained in this regulation have been approved by the Office of Management and Budget (OMB) under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.) and have been assigned OMB Control Number 2120-0056.

(d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Standardization Branch, ANM-113.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113.

(e) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of thisAD can be accomplished.

(f) The inspection, marking, replacement, and rework procedures shall be done in accordance with Fokker Service Bulletin F27/32-162, dated March 8, 1991. 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 Fokker Aircraft USA, Inc., 1199 North Fairfax Street, Alexandria, Virginia 22314. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(g) This amendment becomes effective on June 17, 1993.