91-18-15 FOKKER: Amendment 39-8018. Docket No. 91-NM-54-AD.
Applicability: Model F-28 Mark 0100 series airplanes, Serial Numbers 11244 through 11335, certificated in any category.
Compliance: Required prior to the accumulation of 6,000 landings since new or within 100 days after the effective date of this AD, whichever occurs later, unless previously accomplished.
To prevent cracks and the resultant reduced structural integrity of the vertical stabilizer, accomplish the following:
A. Reinforce the flanges of rib 5.0 by installing finger clips, in accordance with Fokker Service Bulletin F100-55-014, dated November 29, 1990.
B. 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.
NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Standardization Branch, ANM-113.
C. 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, accomplish the following:
D. The installation requirements shall be done in accordance with Fokker Service Bulletin F100-55-014, dated November 29, 1990. 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.
This amendment (39-8018, AD 91-18-15) becomes effective on October 8, 1991.