- Effective
- November 16, 1981
- Published
- November 8, 1981
- Issued
- October 29, 1981
- Models
- PA-31P, PA-31T, PA-31T1
- Data sheet
- TCDSA8EA
- Registered aircraft
- 191 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-4254
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 | 21fd92c5…78a28e7 | FAA DRS (API key needed) |
On this page
The airworthiness directive
81-23-06 PIPER: Amendment 39-4254. Applies to Model PA-31P, Serial Nos. 31P-1 thru 31P-7730012, Model PA-31T, Serial Nos. 31T-7400002 thru 31T-8020086 and Model PA-31T1 Serial Nos. 31T-7804001 thru 31T-8104001 certificated in all categories except aircraft incorporating Piper Kit No. 763 986.
To prevent possible hazards in flight associated with cracks in the outboard flap track, attachment angles, wing rib flange and the rear spar web accomplish the following:
a. Within the next 50 hours in service from the effective date of this AD or upon the attainment of 1000 hours in service, whichever is later, inspect, repair and alter the flap track structure in accordance with Piper Kit No. 763 986 or equivalent.
b. Alternate inspections, repairs or alterations which provide an equivalent level of safety may be used when approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
c. Upon submission of substantiating data by an owner or operatorthrough an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region may adjust the inspection intervals specified in this AD.
(Piper Service Bulletin No. 647A dated November 24, 1980, refers to this subject.)
This amendment is effective November 16, 1981.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 191
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1970 | 3 |
|---|---|
| 1971 | 1 |
| 1972 | 1 |
| 1973 | 8 |
| 1974 | 8 |
| 1975 | 5 |
| 1976 | 12 |
| 1977 | 10 |
| 1978 | 24 |
| 1979 | 23 |
| 1980 | 20 |
| 1981 | 17 |
| 1982 | 4 |
| 1983 | 1 |
| 1984 | 5 |
49 with no year recorded