AD 98-06-28
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 31 | Airworthiness Directives; Learjet Model 31 and 35A Airplanes |
| aircraft | Learjet Inc. | 35A (C-21A) | Airworthiness Directives; Learjet Model 31 and 35A Airplanes |
Unsafe Condition
Two segments of 16 American Wire Gauge (AWG) wire at the P190 connector connected to the E33 auxiliary cabin heater relay box do not provide adequate current-carrying capacity, leading to electrical arcing and consequent fire hazard.
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Required Actions
Within 6 months after the effective date, replace two segments of 16 AWG wire with 8 AWG wire at the P190 connector per Learjet Service Bulletins SB 31-21-10/Rev1 or SB 35-21-24/Rev1. Alternative methods of compliance may be approved by the FAA.
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Compliance Time
Within 6 months after the effective date of this AD
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Affected Aircraft
Learjet Model 31 (serial numbers 31-002 through 31-029) and Model 35A (serial numbers 35-647 through 35-670 inclusive)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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