- Effective
- June 12, 1974
- Models
- YS-11, YS-11A-200, YS-11A-300, YS-11A-500, YS-11A-600
- Data sheet
- TCDSA1PC
- Registered aircraft
- 1 matched by model
- Product
- Aircraft · Large airplane
- Amendment
- 39-1866
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 20 KB | e023683c…40f0556 | FAA DRS (API key needed) |
On this page
The airworthiness directive
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.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 1
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.