AD 99-12-05
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
Cracks developing in the elevator spar inboard of the outboard hinge location due to fatigue cracking, which could result in reduced airplane controllability.
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Required Actions
Install access holes for elevator spar inspection; inspect elevator spars for cracks and ice protection boots for looseness. Reinstall or replace loose ice protection boots before further flight. Replace elevators or spar assemblies with improved design parts if cracks are found or by 2,500 hours TIS, whichever comes first.
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Compliance Time
Within the next 100 hours time-in-service after the effective date or upon accumulating 2,500 hours TIS, whichever is later.
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Affected Aircraft
Piper Models PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P-350 with specified serial numbers not equipped with improved design elevators or spar assemblies per Service Bulletin 998A.
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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