89-11-04 FOKKER: Amendment 39-6220.
Applicability: Model F-28 series airplanes, Serial Numbers 11003 through 11241, 11991 and 11992, certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To prevent decompression of the aircraft during flight, accomplish the following:
A. For airplanes in pre-Service Bulletin F28/21-16 configuration, within 30 days after the effective date of this AD, or upon the accumulation of 75,000 landings, whichever occurs later, inspect the frame 1600 center bracket for cracks, and repair, if necessary, in accordance with Fokker Service Bulletin F28/53-A92, Revision 1, dated July 15, 1988. Repeat this inspection at intervals not to exceed 4,500 landings.
B. For airplanes in post-Service Bulletin F28/21-16 configuration, within 30 days after the effective date of this AD, or upon the accumulation of 50,000 landings, whichever occurs later, inspect the frame 1600 center bracket for cracks, andrepair, if necessary, in accordance with Fokker Service Bulletin F28/53-A92, Revision 1, dated July 15, 1988. Repeat this inspection at intervals not to exceed 3,000 landings.
C. 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, Northwest Mountain Region.
NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who may add any comments and then send it to the Manager, Standardization Branch, ANM-113.
D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of 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 Aircraft USA, Inc., 1199 N. Fairfax Street, Alexandria, Virginia 22314. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.
This amendment (39-6220, AD 89-11-04) becomes effective on June 22, 1989.