- Published
- August 1, 1957
- Issued
- August 1, 1957
- 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 | 02c67826…bb1043c | FAA DRS (API key needed) |
On this page
The airworthiness directive
57-10-02 PIPER: Applies to Model PA-23 Aircraft Serial Numbers 23-1 to 23-1391 Inclusive.
Compliance required as soon as possible but not later than June 15, 1957.
It has been reported that the flare on the oil pressure gage line has cracked or broken where it attaches to the connector fitting on the aft side of the firewall resulting in loss of oil pressure.
Inspect both right and left oil pressure line flares to determine whether or not they are normal and also to determine that the lines in the area of the flares are not cracked or broken.
Lines that are cracked or broken or have defective flares should be cut off and reflared. Care should be taken that there is no line strain against the fitting or the retainer block and that the line into the fitting is straight. If the line is too short for this repair, it should be cut off and spliced using a connector and flexible hose, Piper P/N 17766-07 or equivalent.
(Piper Service Bulletin No. 152A covers this subject.)
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