90-05-04: Engine Mount Ring

90-05-04 CESSNA: Amendment 39-6512. Applicability: Models 208 and 208A (Serial Numbers 20800001 through 20800130), and Model 208B (Serial Numbers 208B0001 through 208B0086) airplanes 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 nose landing gear shimmy and failure of the engine mount ring, accomplish the following: (a) Visually inspect the lower portion of the engine mount ring for misalignment and cracks. (1) If any ring has a visible misalignment, or has a crack longer than 1.7 inches, prior to further flight replace the ring with a serviceable part. (2) If any ring has a crack less than 1.7 inches, prior to further flight repair the ring in accordance with the Cessna Model 208 Maintenance Manual, Part Number (P/N) 02076-2-13. (b) Replace the shimmy dampener (Part Number 2643007-1 or -2) with a Part Number 2643090-1 shimmy dampener in accordance with the instructions in Cessna Caravan Service Bulletin CAB88-14, dated April 8, 1988. (c) Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished. (d) An alternate method of compliance or adjustment of the compliance time which provides an equivalent level of safety, may be approved by the Manager, Wichita Aircraft Certification Office, FAA, 1801 Airport Road, Room 100, Wichita, Kansas 67209. NOTE: The request should be forwarded through an FAA Maintenance Inspector, who may add comments and then send it to the Manager, Wichita Aircraft Certification Office. All persons affected by this directive may obtain copies of the document referred to herein upon request to the Cessna Aircraft Company, P.O. Box 7704, Wichita, Kansas 67277; or may examine this document at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106.This amendment (39-6512, AD 90-05-04) becomes effective on March 23, 1990.