AD 77-09-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23-250 | Airworthiness Directives; Piper Models PA-23-250, PA-24-260, PA-30, PA-31, PA-31-300, PA-31-350, PA-31P, and PA-39 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Models PA-23-250, PA-24-260, PA-30, PA-31, PA-31-300, PA-31-350, PA-31P, and PA-39 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-24-260 | Airworthiness Directives; Piper Models PA-23-250, PA-24-260, PA-30, PA-31, PA-31-300, PA-31-350, PA-31P, and PA-39 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-30 | Airworthiness Directives; Piper Models PA-23-250, PA-24-260, PA-30, PA-31, PA-31-300, PA-31-350, PA-31P, and PA-39 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-31 | Airworthiness Directives; Piper Models PA-23-250, PA-24-260, PA-30, PA-31, PA-31-300, PA-31-350, PA-31P, and PA-39 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-31-300 | Airworthiness Directives; Piper Models PA-23-250, PA-24-260, PA-30, PA-31, PA-31-300, PA-31-350, PA-31P, and PA-39 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-31-350 | Airworthiness Directives; Piper Models PA-23-250, PA-24-260, PA-30, PA-31, PA-31-300, PA-31-350, PA-31P, and PA-39 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-31P | Airworthiness Directives; Piper Models PA-23-250, PA-24-260, PA-30, PA-31, PA-31-300, PA-31-350, PA-31P, and PA-39 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-39 | Airworthiness Directives; Piper Models PA-23-250, PA-24-260, PA-30, PA-31, PA-31-300, PA-31-350, PA-31P, and PA-39 Aircraft |
Unsafe Condition
The electric trim switch may fail, resulting in loss of trim control or unintended trim movement.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the electric trim switch in accordance with Piper Service Bulletin No. 527 dated November 5, 1976, or an equivalent method approved by the FAA. Compliance may be adjusted upon request with substantiating data through an FAA Maintenance Inspector.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours in service after the effective date of this AD
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Affected Aircraft
Piper Models PA-23-250 (S/Nos. 27-3837, 27-3944 to 27-4796), PA-24-260 (S/Nos. 24-4783, 24-4804 to 24-5047), PA-30 (S/Nos. 30-1717, 30-1745 to 30-2000), PA-31 and 31-300 (S/Nos. 31-2 to 31-797), PA-31-350 (S/Nos. 31-5001 to 31-5004), PA-31P (S/Nos. 31P-1 to 31P-109), and PA-39 (S/Nos. 39-1 to 39-155).
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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