AD 71-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-10 | Airworthiness Directives; Mitsubishi Models MU-2B-10, MU-2B-15, MU-2B-20, and MU-2B-30 |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-15 | Airworthiness Directives; Mitsubishi Models MU-2B-10, MU-2B-15, MU-2B-20, and MU-2B-30 |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-20 | Airworthiness Directives; Mitsubishi Models MU-2B-10, MU-2B-15, MU-2B-20, and MU-2B-30 |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-30 | Airworthiness Directives; Mitsubishi Models MU-2B-10, MU-2B-15, MU-2B-20, and MU-2B-30 |
Unsafe Condition
Peeling of the DV1180 fungus resistant coating on the inner surface of the main integral tanks may cause fuel line clogging.
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Required Actions
Visually inspect the inner bottom surface of the main integral fuel tanks below the fuel filler opening for peeling or blistering. If found, drain tanks, inspect entire inner surface, remove defective coating, and rework per Mitsubishi Service Bulletin 143A/143B Method I or II, or FAA-approved equivalent. Repeat inspections at intervals not exceeding 200 hours' time in service.
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Compliance Time
Within the next 10 hours' time in service after the effective date (May 1, 1972) if not inspected in last 100 hours; otherwise within 100 hours' time in service from last inspection.
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Affected Aircraft
Mitsubishi MU-2B-10 (serials 101, 103-111, 113, 116-117, 119-120); MU-2B-15 (serials 114-115, 118); MU-2B-20 (serials 005, 102, 121-127, 129-146, 149-151, 154-170, 172-175, 177-180, 182, 184-185, 187-199, 205-215); MU-2B-30 (serials 502-551).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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