| AD Number | 57-21-01 | Status | Active |
| Effective Date | Not specified | Issue Date | January 23, 1958 |
| Docket Number | Unknown | Amendment | N/A |
| Product Type | ["Aircraft"] | Product Subtype | ["Small Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | --- - _EMPTY_ |
| Citation | This information is not available. | ||
| Manufacturer(s) | Piper Aircraft Inc. |
| Model(s) | PA-23 |
57-21-01 PIPER: Applies to All Model PA-23 Aircraft.
Compliance required at next regular inspection period but not to exceed 100 hours.
Inspect the attachment of the rudder trim tab control rod to the rudder trim tab. If a flat head pin has been installed it must be replaced by an AN 23-10 clevis bolt and AN 960-10L washer, secured with an AN 320-3 nut and AN 380-2-2 cotter pin.
(Piper Service Bulletin No. 159 covers this subject.)