AD 66-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 23 | Airworthiness Directives; LEARJET Models 23 and 24 Airplanes |
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; LEARJET Models 23 and 24 Airplanes |
Unsafe Condition
Windshield deicing alcohol cans may fail, and attitude indicators may be inoperative or insufficiently powered, leading to reduced visibility in icing conditions and inadequate flight instrument reliability.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove windshield deicing alcohol cans on Model 23 airplanes. Limit affected Model 23 airplanes (excluding specified serial numbers) to day VFR conditions below 240 flight level until installing a separate-source powered attitude indicator. Modify electrical systems on specified Model 23 and Model 24 serial ranges per Lear Jet Engineering Change Records within 550 hours' time in service after AD effective date.
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Compliance Time
within 550 hours' time in service after the effective date of this AD
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Affected Aircraft
Learjet Inc. Models 23 and 24 airplanes: Model 23 all serial numbers except listed exceptions; Model 24 serial numbers 24-100 through 24-129
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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