81-06-01 R1 MITSUBISHI HEAVY INDUSTRIES, LTD.: Amendment 39-4062 as amended by Amendment 39-4086. Applies to Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU- 2B-25 and MU-2B-26 (all serial numbers up through and including 347, except Serial Numbers 313 and 321) airplanes certificated in all categories. This AD does not apply to MU-2B series airplanes having serial numbers with the suffix "SA."
COMPLIANCE: Required as indicated unless already accomplished.
To prevent a possible inflight fire in the engine aft nacelle area, accomplish the following:
A) Within the next 50 hours time-in-service after the effective date of this AD, install the braided asbestos seal on both the LH and RH engine aft nacelles in accordance with Modification I of Mitsubishi MU-2 Service Bulletin No. 177B dated September 11, 1980. Installation of the seal can be accomplished without the removal of the engine.
B) Within the next 100 hours time-in-service after the effective date of this AD, on airplane serial numbers 005 through and including 204, modify the engine aft nacelle area and wing trailing edge in accordance with Modification II of Mitsubishi MU-2 Service Bulletin No. 177B dated September 11, 1980.
C) Aircraft may be flown in accordance with FAR 21.197 to a location where these modifications can be accomplished.
D) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing District Office, FAA, Pacific-Asia Region, P.O. Box 50109, Honolulu, Hawaii 96850.
NOTE: All persons affected by this AD who have not already received the applicable service bulletin from the manufacturer may obtain a copy upon request to: Mitsubishi Heavy Industries, Ltd., 10, Oye-cho, Minato-ku, Nagoya, Japan, or Mitsubishi Aircraft International, Inc., P.O. Box 3848, San Angelo, Texas 76901. The Service Bulletin may also be examined at FAA, Pacific-Asia Region, Room 7321, 300 Ala Moana Boulevard, Honolulu, Hawaii 96850, and at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106.
Amendment 39-4062 became effective on March 19, 1981.
This amendment 39-4086 becomes effective on April 1, 1981.