- Effective
- April 7, 1975
- Models
- DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300
- Data sheet
- TCDSA9EA
- Registered aircraft
- 88 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-2149
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 | 5e3957ad…e21ad4f | FAA DRS (API key needed) |
On this page
The airworthiness directive
75-08-02 DE HAVILLAND: Amendment 39-2149. Applies to de Havilland Model DHC- 6 Series Twin Otter Aircraft, Serial Nos. 1 through 135 inclusive.
Compliance required as indicated.
To preclude the hazard created by the failure of the right hand aileron control cable through contact with DC electrical power cable coded 2P66A8, accomplish the following:
(a) Within the next 100 hours' time in service after the effective date of this A.D., alter the attachment of terminal block TB-17 and the routing of the cable harness to terminal block TB-17 and TB-18 in accordance with de Havilland Service Bulletin No. 6/304, Revision B, dated June 28, 1974, or equivalent alteration approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.
(b) Upon request with substantiating data submitted through an FAA inspector, the compliance time specified in this A.D. may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.
This amendment is effective April 7, 1975.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 88
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1966 | 1 |
|---|---|
| 1967 | 5 |
| 1968 | 7 |
| 1969 | 11 |
| 1970 | 2 |
| 1971 | 1 |
| 1973 | 3 |
| 1974 | 6 |
| 1975 | 1 |
| 1976 | 4 |
| 1977 | 6 |
| 1978 | 1 |
| 1979 | 3 |
| 1980 | 5 |
| 1981 | 3 |
| 1982 | 1 |
| 1984 | 1 |
| 1985 | 2 |
25 with no year recorded