| AD Number | 74-12-10 | Status | Active |
| Effective Date | June 12, 1974 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-1866 |
| Product Type | ["Aircraft"] | Product Subtype | ["Large Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Mitsubishi Heavy Industries, Ltd. |
| Model(s) | YS-11 YS-11A-200 YS-11A-300 YS-11A-500 YS-11A-600 |
74-12-10 NIHON AEROPLANE MANUFACTURING COMPANY LIMITED: Amendment 39-1866. Applies to NAMC Model YS-11/11A series airplanes (S/N's 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.
Compliance required within the next 25 hours' time in service after the effective date of this AD unless already accomplished.
To prevent possible malfunction in the auxiliary power unit (APU) wiring harness that could result in a fire, inspect and modify the installation of the APU electrical wiring harnesses in accordance with the Japan Civil Aviation Bureau approved NAMC YS-11 Service Bulletin No. A49-13, dated February 25, 1974 or an equivalent approved by the Chief, Engineering and Manufacturing District Office, FAA, Pacific-Asia Region.
This amendment becomes effective June 12, 1974.