- Effective
- December 14, 1971
- Models
- UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12L and 3 more
- Registered aircraft
- 225 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-1356
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 | e4ad1cf8…9bac275 | FAA DRS (API key needed) |
On this page
The airworthiness directive
71-25-08 FAIRCHILD HILLER ROTORCRAFT: Amdt. 39-1356. Applies to Fairchild Hiller UH-12 helicopters certificated in all categories.
Compliance required as indicated.
Following an immediate visual inspection and within 10 hours time in service after the effective date of this airworthiness directive inspect main rotor blade P/N 53100 for cracks, using dye penetrant. Any blades found defective are to be removed from service prior to further flight and S/Ns reported to Engineering and Manufacturing Branch, Federal Aviation Administration, Eastern Region, JFK International Airport, Jamaica, New York 11430. Approval of this reporting procedure has been obtained from the Bureau of Budget in accordance with Federal Reports Act. Reporting approved by Bureau of Budget under BOB Number 04-R0174.
This amendment is effective December 14, 1971 and was effective upon receipt by owners and operators of the letter dated November 9, 1971 which contained this amendment.
Affected TCDS · 5
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 225
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1949 | 3 |
|---|---|
| 1950 | 4 |
| 1951 | 3 |
| 1952 | 8 |
| 1953 | 6 |
| 1954 | 1 |
| 1955 | 5 |
| 1956 | 16 |
| 1957 | 8 |
| 1958 | 6 |
| 1959 | 8 |
| 1960 | 9 |
| 1961 | 7 |
| 1962 | 13 |
| 1963 | 3 |
| 1964 | 11 |
| 1965 | 6 |
| 1966 | 3 |
| 1973 | 1 |
| 1975 | 3 |
| 1976 | 7 |
| 1977 | 4 |
| 1978 | 3 |
| 1979 | 3 |
| 1980 | 3 |
| 1981 | 3 |
| 1982 | 3 |
| 1993 | 1 |
| 1996 | 1 |
73 with no year recorded