- Effective
- September 22, 1981
- Superseded by
- AD81-18-01 R1
- Models
- 206A, 206A-1 (OH-58A), 206B, 206B-1, 206L, 206L-1
- Data sheet
- TCDSH2SW
- Registered aircraft
- 1,016 matched by model
- Product
- Aircraft · Rotorcraft
- Amendment
- 39-4192
- Docket
- 81-ASW-27
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 | 26 KB | dd94d604…002314b | FAA DRS (API key needed) |
On this page
The airworthiness directive
81-18-01 BELL: Amendment 39-4192. Applies to Models 206A, 206B, 206A-1, 206B-1, 206L, and 206L-1 helicopters, equipped with main rotor trunnions, P/N 206-010-104-3, 206-011- 113-001, 206-011-120-001, 206-011-113-103, and 206-011-120-103, certificated in all categories (Airworthiness Docket No. 81-ASW-27).
Compliance required as indicated.
To prevent possible failure of the main rotor trunnion, P/N's 206-010-104-3, 206-011- 113-001, 206-011-120-001, 206-011-113-103, and 206-011-120-103, due to fatigue cracks, accomplish the following, unless already accomplished:
a. Main rotor trunnions, P/N 206-011-120-001, with 1,100 or more hours' time in service on the effective date of this AD must be retired from service within the next 100 hours' time in service.
b. Main rotor trunnions, P/N 206-011-120-001, with less than 1,100 hours' time in service on the effective date of this AD must be retired from service prior to or on attaining 1,200 hours' time in service.c. Main rotor trunnions, P/N 206-010-104-3, 206-011-113-001, and 206-011-120- 103, with 2,300 or more hours' time in service on the effective date of this AD must be retired from service within the next 100 hours' time in service.
d. Main rotor trunnions, P/N 206-010-104-3, 206-011-113-001, and 206-011-120- 103, with less than 2,300 hours' time in service on the effective date of this AD must be retired from service prior to or on attaining 2,400 hours' time in service.
e. Main rotor trunnions, P/N 206-011-113-103, with 4,700 or more hours' time in service on the effective date of this AD must be retired from service within the next 100 hours' time in service.
f. Main rotor trunnions, P/N 206-011-113-103, with less than 4,700 hours' time in service on the effective date of this AD must be retired from service prior to or on attaining 4,800 hours' time in service.
g. The helicopter may be flown in accordance with FAR 21.197 to a base where compliance with this AD can be performed.
h. The retirement times, for the main rotor trunnions, established by this AD, are as follows:
Part Number Service Life-Hours 206-011-120-001 1,200 206-010-104-3 2,400 206-011-113-001 2,400 206-011-120-103 2,400 206-011-113-103 4,800
(Bell Helicopter Textron Alert Service Bulletins 206-80-7, Rev. B, dated October 15, 1980, and 206L-80-9, Rev. B, dated October 15, 1980, pertain to this subject.)
This amendment becomes effective September 22, 1981.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 1,016
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1954 | 1 |
|---|---|
| 1966 | 1 |
| 1967 | 5 |
| 1968 | 16 |
| 1969 | 12 |
| 1970 | 7 |
| 1971 | 15 |
| 1972 | 22 |
| 1973 | 25 |
| 1974 | 39 |
| 1975 | 39 |
| 1976 | 35 |
| 1977 | 30 |
| 1978 | 49 |
| 1979 | 69 |
| 1980 | 86 |
| 1981 | 77 |
| 1982 | 37 |
| 1983 | 17 |
| 1984 | 7 |
| 1985 | 5 |
| 1986 | 5 |
| 1987 | 4 |
| 1988 | 11 |
| 1989 | 14 |
| 1990 | 7 |
| 1991 | 9 |
| 1992 | 6 |
| 1993 | 24 |
| 1994 | 38 |
| 1995 | 47 |
| 1996 | 4 |
| 1997 | 6 |
| 1998 | 5 |
| 1999 | 4 |
| 2000 | 6 |
| 2001 | 13 |
| 2002 | 7 |
| 2003 | 3 |
| 2004 | 2 |
| 2005 | 5 |
| 2006 | 6 |
| 2007 | 5 |
| 2008 | 3 |
| 2009 | 1 |
187 with no year recorded