AD 71-16-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 23 | Airworthiness Directives; LEARJET Models 23, 24 and 25 Airplanes |
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; LEARJET Models 23, 24 and 25 Airplanes |
| aircraft | Learjet Inc. | 25 | Airworthiness Directives; LEARJET Models 23, 24 and 25 Airplanes |
Unsafe Condition
Battery temperature and charging conditions can result in battery fires and intense heat.
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Required Actions
Conduct a one-time inspection of both batteries for heat damage and marathon (sonotone) battery models with specific cell types. Install Learjet Modification Kit No. AMK 71-10 or equivalent within specified timeframes based on battery cell composition. Operate in accordance with revised flight manuals and service bulletins.
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Compliance Time
Within ten (10) hours' time in service after the effective date of this AD for aircraft with marathon batteries containing polystyrene or mixed cells; within fifty (50) hours' time in service for others. Compliance required as indicated unless already accomplished.
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Affected Aircraft
Learjet Models 23 (S/N 23-003 through 23-099), 24 (S/N 24-100 through 24-247), and 25 (S/N 25-002 through 25-080).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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