- Effective
- August 2, 1966
- Published
- July 23, 1966
- Issued
- July 18, 1966
- Models
- PA-23-250 (Navy UO-1), PA-E23-250
- Data sheet
- TCDS1A10
- Registered aircraft
- 899 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-262
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.
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On this page
The airworthiness directive
66-18-03 PIPER: Amdt. 39-262 Part 39 Federal Register July 23, 1966. Applies to Model PA-23-250 and PA-E23-250 Airplanes, Serial Numbers 27-2505 through 27-3139 and 27- 3141 through 27-3275, Not Equipped With Turbochargers.
Compliance required as indicated, unless already accomplished.
To prevent engine power failures due to induction system icing, accomplish the following:
(a) Within the next 10 hours' time in service after the effective date of this AD, until modified in accordance with (b), attach the following operating limitation placard to the instrument panel in full view of the pilot:
"Do not operate into known or forecast icing conditions.
Do not apply manual alternate air."
(b) Within the next 100 hours' time in service after the effective date of this AD, modify alternate air systems to provide heated alternate air in accordance with Piper Service Bulletin No. 230A, dated May 6, 1966, incorporating Kit No. 757021.
(Piper Service Bulletin No. 230, dated March 4, 1966, also pertains to this subject.)
This directive effective August 2, 1966.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 899
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1953 | 1 |
|---|---|
| 1960 | 33 |
| 1961 | 13 |
| 1962 | 21 |
| 1963 | 19 |
| 1964 | 25 |
| 1965 | 44 |
| 1966 | 59 |
| 1967 | 31 |
| 1968 | 39 |
| 1969 | 49 |
| 1970 | 19 |
| 1971 | 24 |
| 1972 | 27 |
| 1973 | 44 |
| 1974 | 49 |
| 1975 | 36 |
| 1976 | 52 |
| 1977 | 35 |
| 1978 | 36 |
| 1979 | 46 |
| 1980 | 11 |
| 1981 | 10 |
| 1995 | 1 |
175 with no year recorded