- Effective
- January 10, 1974
- Model
- UH-12D
- Data sheet
- TCDS4H10
- Registered aircraft
- 24 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-1752
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 | ade1b340…ededfa4 | FAA DRS (API key needed) |
On this page
The airworthiness directive
73-25-03 HILLER AVIATION: Amdt. 39-1752. Applies to Hiller UH-12D helicopters certificated in all categories.
Compliance required prior to further flight for all UH-12D helicopters which have been converted from the military version (H-23D) before the effective date of this AD, and at the time of conversion for those helicopters which are converted to the UH-12D after the effective date of this AD.
To insure safe service life for the finite life components of the Hiller Model UH-12D Helicopters, accomplish the following:
Replace the finite life components listed in Hiller Aviation's UH-12D Inspection Guide, Airworthiness Limitations Section, dated November 5, 1973, at the times specified therein with new or serviceable parts.
NOTE: A copy of the finite life components list can be obtained from Hiller Aviation, 2075 West Scranton Avenue, Porterville, California, 93257, or from the FAA, Aircraft Engineering Division, P. O. Box 92007, World Way Postal Center, Los Angeles, California 90009.
This amendment becomes effective January 10, 1974.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 24
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 | 2 |
| 1959 | 2 |
| 1961 | 1 |
| 1962 | 4 |
| 1975 | 1 |
| 1976 | 1 |
9 with no year recorded