- Effective
- October 21, 1967
- Published
- October 21, 1967
- 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
- 39-494
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 | 21 KB | 818ad3f3…cf94f1b | FAA DRS (API key needed) |
On this page
The airworthiness directive
67-28-03 de HAVILLAND: Amdt. 39-494, Part 39, Federal Register October 21, 1967. Applies to Type DHC-6 Aircraft.
Compliance required as indicated.
To preclude loss of the horizontal stabilizer, accomplish the following:
(a) Within the next 15 hours' time in service after the effective date of this AD, unless already accomplished, check that each of the four horizontal tailplane to aft fuselage 5/16 inch diameter bolts, P/N's NAS 625-36 and NAS 625-53, are torqued to a value of 225 to 250 inch-pounds. If correct, no further action is necessary. If loose, comply with (b).
(b) Re-torque loose bolts to a value of 225 to 250 inch-pounds and recheck every 7 hours' time in service to assure that this value is maintained.
(c) The check required by (b) may be discontinued when a modification, approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region is incorporated.
(d) Upon request with substantiating data submitted through an FAA maintenance inspector, the compliance times specified in this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.
This amendment effective October 21, 1967.
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