AD 74-12-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11 | Airworthiness Directives; NIHON AEROPLANE MANUFACTURING COMPANY LIMITED Model YS-11/11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-200 | Airworthiness Directives; NIHON AEROPLANE MANUFACTURING COMPANY LIMITED Model YS-11/11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-300 | Airworthiness Directives; NIHON AEROPLANE MANUFACTURING COMPANY LIMITED Model YS-11/11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-500 | Airworthiness Directives; NIHON AEROPLANE MANUFACTURING COMPANY LIMITED Model YS-11/11A Series Airplanes |
| aircraft | Mitsubishi Heavy Industries, Ltd. | YS-11A-600 | Airworthiness Directives; NIHON AEROPLANE MANUFACTURING COMPANY LIMITED Model YS-11/11A Series Airplanes |
Unsafe Condition
Possible malfunction in the auxiliary power unit (APU) wiring harness that could result in a fire.
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Required Actions
Inspect and modify the installation of the APU electrical wiring harnesses in accordance with Japan Civil Aviation Bureau approved NAMC YS-11 Service Bulletin No. A49-13 or an equivalent approved by the Chief, Engineering and Manufacturing District Office, FAA, Pacific-Asia Region.
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Compliance Time
within the next 25 hours' time in service after the effective date of this AD unless already accomplished
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Affected Aircraft
NAMC Model YS-11/11A series airplanes with serial numbers 2050 through 2053, 2056, 2057, 2061, 2062, 2072, 2073, 2075, 2077, 2079, 2084, 2086 through 2089, 2091, 2100, 2118 through 2123, 2126, 2128, 2129, 2132, 2140, 2148, 2159, 2169, 2172, 2173, and 2179 through 2181 equipped with AiResearch APU's.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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