- Published
- December 4, 1956
- Issued
- December 4, 1956
- Model
- PA-23
- Data sheet
- TCDS1A10
- Registered aircraft
- 155 matched by model
- Product
- Aircraft · Small airplane
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 | 20 KB | 37280483…c15d97c | FAA DRS (API key needed) |
On this page
The airworthiness directive
55-14-02 PIPER: Applies to Model PA-23 Serial Numbers 23-1 to 23-208 Inclusive.
Compliance required by August 1, 1955.
Because of possible damage to the hydraulic actuating cylinders for the landing gear system and flap system of the two end plug retaining pins, as a result of excessive pressures caused by thermal expansion, it is necessary that these cylinders be inspected and replaced or modified as follows:
1. If the cylinder housing is upset or fractured, it must be replaced by a new reinforced cylinder P/N 455927.
(Piper Service Bulletin No. 138 dated May 9, 1955, covers this same subject.)
2. If the cylinder housing is not upset or fractured, it must either be replaced by P/N 455927, or reinforced by adding two retaining plugs in accordance with Piper Service Letter No. 250 dated June 8, 1955.
This supersedes AD 55-12-01.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 155
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1954 | 9 |
|---|---|
| 1955 | 34 |
| 1956 | 34 |
| 1957 | 37 |
| 1958 | 1 |
| 1963 | 1 |
39 with no year recorded