AD FAA-2016-9139

The FAA is withdrawing a notice of proposed rulemaking (NPRM) that proposed to adopt a new airworthiness directive (AD) that would have applied to certain Mitsubishi Heavy Industries, Ltd. Models MU-2B- 10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-26A, MU-2B-30, MU-2B- 35, MU-2B-36, MU-2B-36A, MU-2B-40, and MU-2B-60 airplanes. The NPRM resulted from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product and would have required repetitively inspecting the wing spacer plates for cracks until they were replaced with an improved design wing spacer plates. Since issuance of the NPRM, we determined that damage is contained to the wing spacer plate with no evidence that primary structure is affected. Accordingly, the NPRM is withdrawn.