AD 80-06-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 35 | Airworthiness Directives: GATES LEARJET Specified Models |
| aircraft | Learjet Inc. | 35A (C-21A) | Airworthiness Directives: GATES LEARJET Specified Models |
| aircraft | Learjet Inc. | 36 | Airworthiness Directives: GATES LEARJET Specified Models |
| aircraft | Learjet Inc. | 36A | Airworthiness Directives: GATES LEARJET Specified Models |
Unsafe Condition
Unannunciated failure in the electrical system during takeoff or continued flight after a starter assist air start could lead to loss of essential DC power due to malfunctioning 275A Current Limiters or undetected starter disengagement.
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Required Actions
Insert specified procedures in the FAA Approved Airplane Flight Manual within 10 hours time-in-service after the effective date. Procedures include starter disengagement checks and battery charging bus current limiter checks, with specific steps depending on serial number ranges. Replace malfunctioning 275A Current Limiters prior to takeoff if indicated.
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Compliance Time
within the next 10 hours time-in-service after the effective date of this AD
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Affected Aircraft
Gates Learjet Models 35 (Serial Numbers 35-001 thru 35-066); 36 (Serial Numbers 36-001 thru 36-017); 35A (Serial Numbers 35-067 thru 35-288); and 36A (Serial Numbers 36-018 thru 36-044)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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