90-24-08 FOKKER: Amendment 39-6805. Docket No. 90-NM-140-AD.
Applicability: Model F-28 series airplanes, Serial Numbers 11003 to 11241, inclusive, and 11991 and 11992, certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To prevent reduced structural integrity of the fuselage, accomplish the following:
A. For airplanes Serial Numbers 11008 through 11241: Inspect the fuselage lap joint at stringer 73 between frames 5305 and 9305, in accordance with Part 1 of Fokker Service Bulletin F-28/53- A94, Revision 1, dated July 5, 1989, and with the following schedule:
1. For airplanes that accumulated 32,000 landings or more as of August 18, 1989 (the effective date of Amendment 39-6284, AD 89-17-02), inspect within 2 days after August 18, 1989.
2. For airplanes that have accumulated fewer than 32,000 landings as of August 18, 1989, inspect within 60 days after August 18, 1989, or prior to the accumulation of 20,000 landings, whichever occurs later.
B. Repeat the inspections required by paragraph A. of this AD at intervals not to exceed 1,000 landings.
C. If cracks are found, repair prior to further flight, in accordance with Part 2 of Fokker Service Bulletin F28/53-A94, Revision 1, dated July 5, 1989. After repair, continue to inspect in accordance with Part 1 of the service bulletin, at intervals not to exceed 1,000 landings.
D. Replace the lap joint at stringer 73 between frames 4900 through 9805, in accordance with the accomplishment instructions in Fokker Service Bulletin F28/53-95, Revision 1, dated February 16, 1990, according to the schedule below. Accomplishment of this modification terminates the requirement for the repetitive inspections required by paragraphs B. and C. of this AD.
1. For airplanes, Serial Numbers 11008 through 11241, inclusive: prior to the accumulation of 30,000 landings, or within one year after the effective date of this AD, whichever occurslater.
2. For airplanes, Serial Numbers 11003, 11004, 11006, 11991, and 11992: prior to the accumulation of 50,000 landings, or within one year after the effective date of this AD, whichever occurs later.
E. An alternate means 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.
NOTE: The request should be submitted directly to the Manager, Standardization Branch, ANM- 113, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Manager, Standardization Branch, ANM-113.
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.
All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Fokker USA, Inc., 1199 N. Fairfax Street, Alexandria, Virginia 22314. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton Washington.
Airworthiness Directive 90-24-08 supersedes AD 89-17-02 (Amendment 39-6284) which superseded AD 89-07-01 (Amendment 39-6157).
This amendment (39-6805, AD 90-24-08) becomes effective on December 17, 1990.