AD 99-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31 | Airworthiness Directives; The New Piper Aircraft, Inc. Models PA-31, PA-31-300, PA-31-325, PA-31-350, and PA-31P-350 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31-300 | Airworthiness Directives; The New Piper Aircraft, Inc. Models PA-31, PA-31-300, PA-31-325, PA-31-350, and PA-31P-350 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31-325 | Airworthiness Directives; The New Piper Aircraft, Inc. Models PA-31, PA-31-300, PA-31-325, PA-31-350, and PA-31P-350 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31-350 | Airworthiness Directives; The New Piper Aircraft, Inc. Models PA-31, PA-31-300, PA-31-325, PA-31-350, and PA-31P-350 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31P-350 | Airworthiness Directives; The New Piper Aircraft, Inc. Models PA-31, PA-31-300, PA-31-325, PA-31-350, and PA-31P-350 Airplanes |
Unsafe Condition
Failure of the horizontal stabilizer rear spar caused by cracks at the elevator outboard hinge attachment, which could result in loss of control of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 100 hours time-in-service after the effective date, inspect the horizontal stabilizer rear spar and outboard hinge attach bracket for cracks. If cracks are found, modify the spar by incorporating Piper Kit No. 766-646 before further flight. If no cracks are found, continue inspections every 100 hours TIS until cracks are found or until 500 hours TIS after the effective date, then modify the spar.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 100 hours time-in-service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Models PA-31, PA-31-300, PA-31-325 (serial numbers 31-2 through 31-8312019), PA-31-350 (serial numbers 31-5001 through 31-8553002), and PA-31P-350 (serial numbers 31P-8414001 through 31P-8414050)
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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