- Effective
- September 5, 1989
- Superseded by
- AD2000-08-53
- Models
- UH-1F, TH-1L, UH-1B, UH-1E, UH-1F, UH-1L and 15 more
- Registered aircraft
- 8 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-6251
- Docket
- 88-ASW-33
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 August 7, 2025.
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 | 24 KB | ea0c0648…b661bdf | FAA DRS (API key needed) |
On this page
The airworthiness directive
89-17-03 CALIFORNIA DEPARTMENT OF FORESTRY; GARLICK HELICOPTERS; HAWKINS AND POWERS AVIATION, INC; HERCULES; INTERNATIONAL HELICOPTERS, INC; OREGON HELICOPTERS; PILOT PERSONNEL INTERNATIONAL, INC; SMITH HELICOPTERS; SOUTHERN AERO CORPORATION, AND WEST COAST FABRICATIONS (these helicopters were manufactured by Bell Helicopter Textron, Inc., under military contract): Amendment 39- 6251. (Airworthiness Docket No. 88-ASW-33)
Applicability: Model UH-1A, UH-1B, UH-1E, UH-1F, UH-1L, and TH-1L helicopters certificated in any category.
Compliance: Required as indicated, unless already accomplished.
To prevent possible fatigue failure of the main rotor masts, part number (P/N) 204-011- 450-001, -005, -007, -101, -105, -109, and -113, and main rotor trunnion, (P/N) 204-011-105-001, which could result in a catastrophic failure of the main rotor system and subsequent loss of the helicopter, accomplish the following:
(a) Within 10 days after the effective date of this AD,create a historical service record for the main rotor mast, (P/N) 204-011-450-001, -005, -007, -101, -105, -109, and -113, and main rotor trunnion, (P/N) 204-011-105-001, and record the hours' time in service accumulated on the main rotor mast and trunnion. If the time in service cannot be determined, enter 900 hours for each year from the date the mast and trunnion were installed.
(b) For masts and trunnions with more than 14,900 hours' time in service on the effective date of this AD, remove the masts and trunnions from service within the next 100 hours' time in service.
(c) For masts and trunnions with less than 14,900 hours' time in service on the effective date of this AD, remove the masts and trunnions from service at 15,000 hours' time in service.
(d) An alternate means of compliance which provides an equivalent level of safety with this AD may be used when approved by the Manager, Rotorcraft Certification Office, ASW-170, Federal Aviation Administration, Fort Worth, Texas 76193-0170.
This amendment (39-6251, AD 89-17-03) becomes effective on September 5, 1989.
Affected TCDS · 4
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 8
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1961 | 2 |
|---|---|
| 1962 | 2 |
| 1967 | 1 |
3 with no year recorded
By model
Aircraft
NTSB investigations that cite this AD · 1
Their narratives or probable cause name AD 89-17-03, often to say whether the aircraft complied with it.