91-26-04 BRITISH AEROSPACE: Amendment 39-8115. Docket No. 91-NM-140-AD.
Applicability: Model ATP series airplanes, equipped with nose landing gear (NLG) part number 201049001 or 201278001/002, pre Dowty Aerospace Gloucester modification (c)AC11432 standard, certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To prevent reduced structural integrity of the NLG, accomplish the following:
(a) Within 60 days after the effective date of this AD, modify the NLG, treat the main fitting of the NLG with corrosion inhibitor, and externally seal the cover sub-assembly in accordance with British Aerospace Service Bulletin ATP 32-33, dated March 1, 1991.
NOTE: The British Aerospace Service Bulletin references Dowty Aerospace Gloucester Service Bulletin 200-32-143, dated February 20, 1991.
(b) Repeat the application of corrosion inhibitor at intervals not to exceed 6 months from the previous application, in accordance with British Aerospace Service Bulletin ATP-32-33, dated March 1, 1991.
(c) Install Dowty Aerospace Gloucester modification (c)AC11432 on all pre-modification (c)AC11432 NLG's in accordance with British Aerospace Service Bulletin ATP-32-33, dated March 1, 1991, at the later of the times specified in subparagraphs (c)(1) and (c)(2), below:
(1) Prior to the accumulation of 6,000 landings on the NLG since new, or within 3 years from the first flight on the NLG, whichever occurs first; or
(2) Within 12 months after the effective date of this AD.
NOTE: The British Aerospace Service Bulletin references Dowty Aerospace Gloucester Service Bulletin 200-32-144, dated February 20, 1991, which describes modification (c)AC11432.
(d) Installation of Dowty Aerospace Gloucester modification (c)AC11432 constitutes terminating action for the repetitive applications of corrosion inhibitor required by paragraphs (a) and (b) of this AD.
(e) An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. The request shall be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Standardization Branch.
(f) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.
(g) The modifications and application of corrosion inhibitor required by this AD shall be done in accordance with British Aerospace Service Bulletin ATP-32-33, dated March 1, 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 British Aerospace, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.
(h) This amendment (39-8115, AD 91-26-04) becomes effective on January 27, 1992.