AD 85-16-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 35 | Airworthiness Directives; Gates Learjet Model 35, 35A, 36, and 36A Series Airplanes |
| aircraft | Learjet Inc. | 35A (C-21A) | Airworthiness Directives; Gates Learjet Model 35, 35A, 36, and 36A Series Airplanes |
| aircraft | Learjet Inc. | 36 | Airworthiness Directives; Gates Learjet Model 35, 35A, 36, and 36A Series Airplanes |
| aircraft | Learjet Inc. | 36A | Airworthiness Directives; Gates Learjet Model 35, 35A, 36, and 36A Series Airplanes |
Unsafe Condition
Deterioration of airplane lateral control characteristics due to aileron buffet or buzz.
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Required Actions
Within 200 hours time in service or six months after the effective date, reduce MMO by submitting STC SA766NW AFM supplement to FAA, recalibrate Mach overspeed warning switch and airspeed indicators, or remove Raisbeck STC SA766NW modifications and return to original configuration or Gates Learjet 'Softflight' configuration. Alternate compliance may be approved.
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Compliance Time
Within the next 200 hours time in service or six months after the effective date of this AD, whichever comes first
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Affected Aircraft
Gates Learjet Model 35, 35A, 36, 36A series airplanes modified by Raisbeck Group STC SA766NW, with specified serial numbers listed in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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