AD 93-23-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 60 | Airworthiness Directives; Learjet Model 60 Airplane |
Unsafe Condition
Overheating of the auxiliary cabin and cockpit heaters could potentially result in a fire.
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Required Actions
Deactivate the auxiliary cabin and cockpit heating systems within 10 flight hours after the effective date. Install a placard stating 'Cabin and Cockpit Heat Inop' adjacent to the AUX HT Switch (S44) on the co-pilot's switch panel. Compliance must follow Learjet Alert Service Bulletin SB A60-21-1.
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Compliance Time
Within 10 flight hours after the effective date of this AD
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Affected Aircraft
Learjet Model 60 airplanes with serial numbers 60-002 through 60-021, inclusive, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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