AD 78-03-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B | Airworthiness Directives; Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-10 | Airworthiness Directives; Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-15 | Airworthiness Directives; Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-20 | Airworthiness Directives; Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-25 | Airworthiness Directives; Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-26 | Airworthiness Directives; Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-30 | Airworthiness Directives; Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-35 | Airworthiness Directives; Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-36 | Airworthiness Directives; Models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 Airplanes |
Unsafe Condition
Failure of the cowling latches between the engine nacelle upper door and side doors, subsequent separation of the upper cowling panel, and possible loss of control of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the cowling latch links between the engine nacelle upper door and side doors in accordance with Mitsubishi MU-2 Service Bulletin No. 171A dated July 14, 1975, supplemented by Service Bulletin No. 180 or 180A, or an FAA-approved equivalent.
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Compliance Time
Within the next 25 hours time in service after the effective date of this AD
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Affected Aircraft
Mitsubishi Heavy Industries, Ltd. models MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, MU-2B-26, MU-2B-30, MU-2B-35, and MU-2B-36 airplanes with serial numbers up through and including 347 (except 313 and 321) and up through 696 (except 652 and 661), excluding serial numbers with the suffix 'SA'.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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