Airworthiness Directive · Amendment 39-18063 · Fuselage
Mitsubishi Heavy Industries, Ltd. Airplanes
This AD applies to Mitsubishi Heavy Industries, Ltd. Models MU-2B-30, MU-2B-35, and MU-2B-36 airplanes, serial numbers 502 through 651, 653 through 660, and 662 through 696, and Models MU-2B-36A and MU-2B-60 airplanes, serial numbers 661SA, 697SA through 799SA, and 1501SA through 1569SA, certificated in any category.
We are adopting a new airworthiness directive (AD) for certain Mitsubishi Heavy Industries, Ltd. Models MU-2B-30, MU-2B-35, MU-2B-36, MU-2B-36A, and MU-2B-60 airplanes. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as stress corrosion cracking in the flanges of the airframe at stations 4610 and 5605. We are issuing this AD to require actions to address the unsafe condition on these products.
Unless already done, do the actions in paragraphs (f)(1) through (f)(3) of this AD.
(1) Within the next 1,000 hours time-in-service (TIS) after February 26, 2015 (the effective date of this AD) or within the next 3 years after February 26, 2015 (the effective date of this AD), whichever occurs first, inspect the side and lower frames at frame station (STA) 4610 and STA 5605 for cracks and corrosion. Do the inspection following paragraphs 3.0 through 3.3 of Mitsubishi Heavy Industries, Ltd. MU-2 Service Bulletin No. 242, dated July 10, 2013, or Mitsubishi Heavy Industries, Ltd. MU-2 Service Bulletin No. 104/53-003, dated July 22, 2013, as applicable.
(2) If any crack is found during the inspection required in paragraph (f)(1) of this AD, before further flight, do the actions in paragraphs (f)(2)(i) or (f)(2)(ii) of this AD:
(i) Repair the frame following paragraphs 4.0 and 5.0 of Mitsubishi Heavy Industries, Ltd. MU-2 Service Bulletin No. 242, dated July 10, 2013, or Mitsubishi Heavy Industries, Ltd. MU-2 Service Bulletin No. 104/53-003, dated July 22, 2013, as applicable; or
(ii) Replace the frame following paragraphs 4.0, 6.0, and 7.0 of Mitsubishi Heavy Industries, Ltd. MU-2 Service Bulletin No. 242, dated July 10, 2013, or Mitsubishi Heavy Industries, Ltd. MU-2 Service Bulletin No. 104/53-003, dated July 22, 2013, as applicable.
(3) If any corrosion is found during the inspection required in paragraph (f)(1) of this AD, before further flight, repair the damage following the instructions in paragraph 3.2 of Mitsubishi Heavy Industries, Ltd. Service Bulletin No. 242, dated July 10, 2013, or Mitsubishi Heavy Industries, Ltd. Service Bulletin No. 104/53-003, dated July 22, 2013, as applicable.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
