- Published
- December 4, 1956
- Issued
- December 4, 1956
- Models
- PA-16, PA-20, PA-22
- Registered aircraft
- 829 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 | 19 KB | 15f066d0…768d9c4 | FAA DRS (API key needed) |
On this page
The airworthiness directive
51-23-03 PIPER: Applies to Model PA-16 Aircraft, Serial Numbers 16-1 and Up; PA-20 Aircraft, Serial Numbers 20-1 Through 20-802; and PA-22 Aircraft, Serial Numbers 22-1 Through 22-348.
Compliance required as soon as possible, but not later than October 15, 1951.
Install insulators of sufficient area inside the battery box cover over the battery terminals to positively prevent a metallic contact between the wing nuts or terminals and cover. Hard fiber rubber or phenolic insulating materials 1/16-inch minimum thickness may be used.
(Piper Service Bulletin No. 118 covers this same subject.)
Affected TCDS · 3
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 829
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1944 | 1 |
|---|---|
| 1946 | 1 |
| 1947 | 1 |
| 1948 | 2 |
| 1949 | 208 |
| 1950 | 137 |
| 1951 | 102 |
| 1952 | 58 |
| 1953 | 58 |
| 1954 | 25 |
| 1955 | 20 |
| 1956 | 11 |
| 1957 | 2 |
| 1958 | 3 |
| 1959 | 5 |
| 1961 | 3 |
| 1963 | 1 |
| 1979 | 1 |
190 with no year recorded