- Effective
- January 6, 1978
- Models
- UH-12C, UH-12D, UH-12L, UH-12L4, UH-12E, UH-12E-L
- Registered aircraft
- 168 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-3088
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 |
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| FAA DRS HTML | 21 KB | 6c2d4b8d…ec627e9 | FAA DRS (API key needed) |
On this page
The airworthiness directive
77-24-03 HILLER HELICOPTERS: Amendment 39-3088. Applies to Hiller Model UH-12C, D, E (4 place), L, E-L, and L4's certificated in all categories incorporating control levers P/N 72229 or 72210. All aircraft serial numbers up to No. 5024 are included. S/N 5024 and subsequent will have the guard installed at the time of manufacture.
(a) To prevent hazardous engine power loss from inadvertent shutoff of the fuel control valve, within the next 100 hours time in service after the effective date of this AD, install a guard on the fuel shutoff valve handle in accordance with the instructions described in Paragraph 2B in Hiller Service Bulletin No. 72-1 dated June 17, 1977, or later FAA approved revision.
(b) Equivalent methods of fabrication and installation of a guard on the fuel shutoff valve handle may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region.
(c) Special flight permits may be issued in accordance with FAR's 21.197 and 21.199 to operate helicopters to a base for accomplishment of the modification required by Paragraph (a) of this AD.
This amendment becomes effective January 6, 1978.
Affected TCDS · 4
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 168
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1955 | 2 |
|---|---|
| 1956 | 15 |
| 1957 | 8 |
| 1958 | 6 |
| 1959 | 8 |
| 1960 | 8 |
| 1961 | 6 |
| 1962 | 12 |
| 1963 | 2 |
| 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 |
49 with no year recorded