AD 80-17-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 35 | Airworthiness Directives; Gates Learjet Model 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 35A (C-21A) | Airworthiness Directives; Gates Learjet Model 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 36 | Airworthiness Directives; Gates Learjet Model 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 36A | Airworthiness Directives; Gates Learjet Model 35 and 36 Series Airplanes |
Unsafe Condition
Encountering a possible overload flight condition that could fail the forward engine mount.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install airspeed warning placards and modify the Mach/overspeed switch circuit to reduce VMO to 307 KIAS. Insert a temporary AFM supplement from SB 35/36-11-3. Replace or re-age both forward engine mounts within 600 hours' time-in-service using AMK 80-6 at authorized facilities. Obtain Special Flight Permits under FAR 21.197 if needed for relocation.
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Compliance Time
Within the next 75 hours time-in-service after the effective date of this AD for Paragraph A; within the next 600 hours' time-in-service after the effective date for Paragraph B.
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Affected Aircraft
Gates Learjet Model 35 (serial 35-050 through 35-339 except 35-054 and 35-065) and Model 36 (serial 36-017 through 36-045).
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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