91-08-08: Elevator Spar Truss and Reinforcement Angle Bar

91-08-08 MESSERSCHMITT-BOLKOW-BLOHM GMBH: Amendment 39-6964; Docket No. 90-CE-41-AD. Applicability: Models BO-209-150FV, BO-209-150RV, BO-209-160FV, BO-209-160RV, BO-209-150FF "Monsun" airplanes (all serial numbers), certificated in any category. Compliance: Required within the next 100 hours time-in-service after the effective date of this AD, unless already accomplished. To prevent failure of the elevator spar truss and mass balance attachment rib, accomplish the following: (a) Dye penetrant inspect the elevator spar truss and reinforcement angle bar for cracks in accordance with the instructions in Measure I of MBB Technical Note No. 209-1/88, dated June 22, 1988. (1) If cracks are found, prior to further flight, repair in accordance with the instructions in Measure I, paragraph b) of MBB Technical Note No. 209-1/88, dated June 22, 1988 and then install a doubler in accordance with the instructions in Measure I, paragraph a) of MBB Technical Note No.209-1/88, dated June 22, 1988. (2) If cracks are not found, prior to further flight, install a doubler in accordance with the instructions in Measure I, paragraph a) of MBB Technical Note No. 209-1/88, dated June 22, 1988. (b) Visually inspect the mass balance attachment at the elevator nose rib for cracks in accordance with the instructions in Measure II of MBB Technical Note No. 209-1/88, dated June 22, 1988, and prior to further flight, replace, repair, or modify the rib in accordance with the instructions in Coversheet to Repair Instruction Elevator 209-31014RA1 and Measure II of MBB Technical Note No. 209-1/88, both dated June 22, 1988. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a location where the requirements of this AD can be accomplished. (d) An alternate method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Brussels Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, B-1000 Brussels, Belgium. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Staff. (e) All persons affected by this directive may obtain copies of the documents referred to herein upon request to Messerschmitt-Bolkow-Blohm GmbH, Post fach 801160, D-8000 Munchen 80, Federal Republic of Germany; or may examine these documents at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. This amendment (39-6964, AD 91-08-08) becomes effective on May 13, 1991.