AD 79-20-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-24 | Airworthiness Directives; Piper Model PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, and PA-39 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-24-250 | Airworthiness Directives; Piper Model PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, and PA-39 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-24-260 | Airworthiness Directives; Piper Model PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, and PA-39 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-24-400 | Airworthiness Directives; Piper Model PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, and PA-39 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-30 | Airworthiness Directives; Piper Model PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, and PA-39 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-39 | Airworthiness Directives; Piper Model PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, and PA-39 Airplanes |
Unsafe Condition
Failure of the horizontal stabilizer due to fatigue cracking in the spar cap or spar web of the horizontal stabilizer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the horizontal stabilizer spar cap and spar web in accordance with Service Letter No. 850 dated April 18, 1979, Parts 1, 2, 3, 4a, b, and c. Perform inspections within the next 50 hours in service and at intervals not exceeding 100 hours in service thereafter. Terminate inspections upon incorporation of Piper Kit No. 763 893 or equivalent.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 hours in service after the effective date of this AD, unless already accomplished within the past 50 hours in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Piper Model PA-24, PA-24-250, PA-24-260, PA-24-400, PA-30, and PA-39 airplanes with serial numbers as specified: PA-24 (24-1 and up), PA-24-250 (24-1 and up), PA-24-260 (24-3642, 24-4000 and up), PA-24-400 (26-1 and up), PA-30 (30-1 and up), PA-39 (39-1 and up), except those incorporating Piper Kit Part No. 763 893.
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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