- Effective
- January 4, 1979
- Published
- December 26, 1978
- Issued
- December 13, 1978
- Model
- PA-31-350
- Data sheet
- TCDSA20SO
- Registered aircraft
- 399 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-3380
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 November 21, 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 | 21 KB | 09798c26…d430a1f | FAA DRS (API key needed) |
On this page
The airworthiness directive
78-26-11 PIPER AIRCRAFT CORPORATION: Amendment 39-3380. Applies to Piper PA-31-350 Navajo Chieftain aircraft, Serial Numbers 31-5001 through 31-7852151, certificated in all categories.
Compliance required within the next 25 hours of operation after the effective date of this AD.
To insure free operation of the elevator control system, accomplish the following:
1. Install cable guide tube, Piper Part Number 71045-2, around the lightening hole in the frame at Fuselage Station 87.50, in accordance with the "Instructions" section of Piper Service Bulletin 621, dated October 13, 1978, or later edition approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.
2. Install nylon spiral sleeving around hydraulic line in accordance with the above referenced instructions.
3. Adjust elevator control cable tension in accordance with the above referenced instructions and instructions contained in the Piper PA-31-350 Navajo Chieftain Service Manual.
Compliance with the provisions of this AD may be accomplished in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.
This amendment becomes effective January 4, 1979.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 399
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1973 | 14 |
|---|---|
| 1974 | 15 |
| 1975 | 17 |
| 1976 | 18 |
| 1977 | 27 |
| 1978 | 25 |
| 1979 | 44 |
| 1980 | 53 |
| 1981 | 53 |
| 1982 | 16 |
| 1983 | 12 |
| 1984 | 11 |
| 1996 | 1 |
93 with no year recorded