AD 82-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B | Airworthiness Directives; Mitsubishi Model MU-2B/-10/-15/-20/-25, MU-2B-30 and MU-2B-36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-10 | Airworthiness Directives; Mitsubishi Model MU-2B/-10/-15/-20/-25, MU-2B-30 and MU-2B-36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-15 | Airworthiness Directives; Mitsubishi Model MU-2B/-10/-15/-20/-25, MU-2B-30 and MU-2B-36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-20 | Airworthiness Directives; Mitsubishi Model MU-2B/-10/-15/-20/-25, MU-2B-30 and MU-2B-36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-25 | Airworthiness Directives; Mitsubishi Model MU-2B/-10/-15/-20/-25, MU-2B-30 and MU-2B-36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-30 | Airworthiness Directives; Mitsubishi Model MU-2B/-10/-15/-20/-25, MU-2B-30 and MU-2B-36 Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | MU-2B-36 | Airworthiness Directives; Mitsubishi Model MU-2B/-10/-15/-20/-25, MU-2B-30 and MU-2B-36 Series Airplanes |
Unsafe Condition
Failure of the engine fire detecting and DC power emergency relay circuits could result in incorrect fire detection and loss of DC power emergency relay function.
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Required Actions
Inspect and repair the engine fire detecting and DC power emergency relay circuits as prescribed in Sections I and II of MHI Service Bulletin 187. Aircraft may be flown under FAR 21.197 to a maintenance facility for this inspection. An alternate means of compliance may be used if approved by the Manager, Honolulu Aircraft Certification Field Office.
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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. Model MU-2B/-10/-15/-20/-25 (Serial Numbers 005 thru 238), MU-2B-30 (Serial Numbers 502 thru 547), and MU-2B-36 (Serial Number 501). Excludes MU-2B with serial numbers having 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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