AD 77-01-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31 | Airworthiness Directives; Piper Models PA-31, PA-31-325, and PA-31-350 |
| aircraft | Piper Aircraft Inc. | PA-31-325 | Airworthiness Directives; Piper Models PA-31, PA-31-325, and PA-31-350 |
| aircraft | Piper Aircraft Inc. | PA-31-350 | Airworthiness Directives; Piper Models PA-31, PA-31-325, and PA-31-350 |
Unsafe Condition
Missing horizontal stabilizer skin-stiffener rivet attachments could cause possible hazards in flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and repair the horizontal stabilizer skin-stiffener rivet attachment in accordance with Piper Service Bulletin No. 521 or equivalent procedures approved by the FAA.
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Compliance Time
within the next fifty hours in service from the effective date of this AD
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Affected Aircraft
Piper Models PA-31, PA-31-325, and PA-31-350 with specific serial numbers: PA-31/PA-31-325 serials 31-7612060 through 31-7612080, 31-7612082 through 31-7612089, 31-7612091, 31-7612096, 31-7612099; PA-31-350 serials 31-7652105 through 31-7652115, 31-7652117, 31-7652118, 31-7652120 through 31-7652146, 31-7652148 through 31-7652162, 31-7652164, 31-7652165, 31-7652168 and above, and aircraft with a replacement horizontal stabilizer installed in the field after April 1976.
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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