91-07-10 FOKKER: Amendment 39-6949. Docket No. 90-NM-178-AD.
Applicability: Certain Model F-28 Mark 0100 series airplanes; Serial Numbers 11244 through 11266, 11268 through 11283, 11286, 11289, 11291 through 11293, 11295, 11297, 11300, 11303, and 11306; certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To prevent main landing gear (MLG) vibration and subsequent failure of the MLG, accomplish the following:
A. For airplanes Serial Numbers 11244 through 11263, 11268 through 11283, 11286, 11289, 11291, 11293, 11295, and 11297: Within 180 days after the effective date of this AD, replace the MLG wire harness assembly brackets in accordance with Fokker Service Bulletin F100-32-034, dated March 9, 1990.
NOTE: The Accomplishment Instructions of SB F100-32-034 specifies that the wire harness brackets, P/N A11508-425/-426, be discarded and new ones, P/N 20645-401/-402, be installed. The wire harness brackets, P/N A11508-425/-426, may be reused provided it is verified the wire harness does not rub any structure (rear spar flange) with the landing gear in any position.
B. For airplanes Serial Numbers 11244 through 11266, 11268 through 11283, 11286, 11289, 11291 through 11293, 11295, 11297, 11300, 11303, and 11306: Within 180 days after the effective date of this AD, install torque link (TL) dampers and TL subassemblies on the MLG in accordance with Dowty Rotol Service Bulletin F100-32-34, dated March 14, 1990.
C. 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.
D. 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 Aircraft USA, Inc., 1199 North 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.
This amendment (39-6949, AD 91-07-10) becomes effective on April 29, 1991.