- Effective
- September 20, 1984
- Models
- UH-12D, UH-12E, UH-12E-L
- Registered aircraft
- 129 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-4914
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 | 22 KB | cdbb11bf…19bbb67 | FAA DRS (API key needed) |
On this page
The airworthiness directive
84-19-08 HILLER HELICOPTERS, a subsidiary of Rogerson Aircraft Corp (formerly Hiller Aviation): Amendment 39-4914. Applies to Model UH-12D and UH-12E series helicopters equipped with engine mount Part No. 63181-5 certificated in any category which have been converted to turbine power by STC SH177WE or SH178WE.
Compliance is required as indicated (unless already accomplished).
(a) Within the next 20 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 600 hours time in service from the last inspection, remove the paint from the outer gimbal forward attach fitting of the Hiller engine mount Part No. 63181-5 and dye penetrant or magnetic particle inspect the gusset weld beads for cracks on both the front and back sides of the gusset.
(b) If cracks are found, replace the engine mount Part No. 63181-5 before further flight.
(c) Prior to or immediately following installation or reinstallation of engine mount Part No.63181-5 in any of the Model UH-12 series helicopters listed above, perform the inspection required by paragraph (a) of this AD.
(d) Alternative inspections, modifications, or other actions which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, 17900 Pacific Highway South, C-68966, Seattle, Washington 98168.
This supersedes Amendment 39-3538 (44 FR 50035; August 27, 1979), AD 79-18-01. This amendment becomes effective September 20, 1984.
Affected TCDS · 2
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 129
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1957 | 4 |
|---|---|
| 1958 | 4 |
| 1959 | 7 |
| 1960 | 8 |
| 1961 | 6 |
| 1962 | 12 |
| 1963 | 2 |
| 1964 | 10 |
| 1965 | 6 |
| 1966 | 1 |
| 1973 | 1 |
| 1975 | 3 |
| 1976 | 7 |
| 1977 | 4 |
| 1978 | 3 |
| 1979 | 3 |
| 1980 | 3 |
| 1981 | 3 |
| 1982 | 3 |
| 1993 | 1 |
| 1996 | 1 |
37 with no year recorded