92-19-02 FOKKER: Amendment 39-8359. Docket 92-NM-41-AD.
Applicability: Model F28 series airplanes; serial numbers 11003 through 11241, 11991, and 11992; certificated in any category.
Compliance: Required as indicated, unless accomplished previously.
To prevent reduced structural integrity of the lapjoints between stringers 16 and 17, and consequent decompression, accomplish the following:
(a) For airplanes in the post-SBF28/21-16 configuration, repair the lapjoints located between stringers 16 and 17 (58 and 59), between frames 13345 and 14285, in accordance with Fokker Service Bulletin F28/53-121, Revision 1, dated December 13, 1991, and in accordance with the following schedule:
(1) For airplanes that have accumulated less than 32,000 flight cycles as of the effective date of this AD, accomplish the repair prior to the accumulation of 32,000 flight cycles or within 35 months after the effective date of this AD, whichever occurs later;
(2) For airplanes that have accumulated 32,000 or more flight cycles but less than 40,000 flight cycles as of the effective date of this AD, accomplish the repair prior to the accumulation of 40,000 flight cycles or within 23 months after the effective date of this AD, whichever occurs later;
(3) For airplanes that have accumulated 40,000 or more flight cycles as of the effective date of this AD, accomplish the repair within 11 months after the effective date of this AD.
(b) For airplanes in the pre-SBF28/21-16 configuration, repair the lapjoints located between stringers 16 and 17, (58 and 59) between frames 13345 and 14285, in accordance with Fokker Service Bulletin F28/53-121, Revision 1, dated December 13, 1991, and in accordance with the following schedule:
(1) For airplanes that have accumulated less than 48,000 flight cycles as of the effective date of this AD, accomplish the repair prior to the accumulation of 48,000 flight cycles or within 35 months after the effective dateof this AD, whichever occurs later.
(2) For airplanes that have accumulated 48,000 or more flight cycles but less than 60,000 flight cycles as of the effective date of this AD, accomplish the repair prior to the accumulation of 60,000 flight cycles or within 23 months after the effective date of this AD, whichever occurs later.
(3) For airplanes that have accumulated 60,000 or more flight cycles as of the effective date of this AD, accomplish the repair within 11 months after the effective date of this AD.
(c) Accomplishment of the repairs required by paragraphs (a) and (b) of this AD constitutes terminating action for the inspections identified as item 53-30-08 in the Fokker F-28 Structural Integrity Program (SIP), which are required by AD 89-07-16 R1, Amendment 39-6444.
(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 this AD can be accomplished.
(f) The repair shall be done in accordance with Fokker Service Bulletin F28/53-121, Revision 1, dated December 13, 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 October 8, 1992.