AD 83-09-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-25 | Airworthiness Directives; Mitsubishi Model MU-2B-25, -26, MU-2B-30, -35, and -36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-26 | Airworthiness Directives; Mitsubishi Model MU-2B-25, -26, MU-2B-30, -35, and -36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-30 | Airworthiness Directives; Mitsubishi Model MU-2B-25, -26, MU-2B-30, -35, and -36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-35 | Airworthiness Directives; Mitsubishi Model MU-2B-25, -26, MU-2B-30, -35, and -36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-36 | Airworthiness Directives; Mitsubishi Model MU-2B-25, -26, MU-2B-30, -35, and -36 Series Airplanes |
Unsafe Condition
Fuel or fuel vapors entering the wing tip strobe light assemblies could lead to fuel leakage into the wing tip fuel tanks.
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Required Actions
Inspect the strobe light conduit tubes in the wing tip fuel tanks as detailed in MU-2 Service Bulletin No. 174C. If leaks are found, modify the tip tank conduit tube in accordance with the SB's Rework Procedure. Additionally, modify the tip tank conduit tubes by September 1, 1983, and adjust inspection intervals up to 10% for concurrent maintenance.
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Compliance Time
Within the next 100 hours time-in-service after the effective date of this AD and thereafter at intervals not to exceed 100 hours time-in-service from the last inspection
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Affected Aircraft
Mitsubishi Heavy Industries, Ltd. Models MU-2B-25 and -26 (serial numbers 239 through 328; except serial numbers 313, 321, and airplanes with 'SA' suffix) and Models MU-2B-30, -35, and -36 (serial numbers 501, 504, 548 through 673; except serial numbers 652, 661 and airplanes with 'SA' suffix)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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