AD 78-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 35 | Airworthiness Directives; Gates Learjet Model 35 and 36 Airplanes |
| aircraft | Learjet Inc. | 36 | Airworthiness Directives; Gates Learjet Model 35 and 36 Airplanes |
Unsafe Condition
Cracked, bent, broken, or worn bolt 5 in the cabin door mechanism could prevent proper locking of the upper door, leading to possible unwanted door openings.
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Required Actions
Inspect and replace bolt 5 for cracks, breaks, bends, or wear; inspect door locking mechanism for wear and defects, including hole diameter not exceeding 0.201 inches; submit reports on defective bolts to FAA. Replace bolts with specified parts and ensure door mechanism functions without binding.
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Compliance Time
Initial inspections/replacements based on total time in service: prior to 3,075 hours or within 75 hours after AD effective date for certain ranges, with repetitive intervals of 3,000 hours. Locking mechanism inspections must occur first if bolt defects are found, with intervals tied to bolt inspection schedules.
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Affected Aircraft
Gates Learjet Model 35 (serial numbers 35-001 through 35-167) and Model 36 (serial numbers 36-001 through 36-038) with 36-inch wide cabin doors.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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