AD 78-16-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 23 | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
| aircraft | Learjet Inc. | 24A | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
| aircraft | Learjet Inc. | 24B | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
| aircraft | Learjet Inc. | 24B-A | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
| aircraft | Learjet Inc. | 24C | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
| aircraft | Learjet Inc. | 24D | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
| aircraft | Learjet Inc. | 24D-A | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
| aircraft | Learjet Inc. | 24E | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
| aircraft | Learjet Inc. | 24F | Airworthiness Directives; Learjet Models 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F 35, 35A, 36, and 36A Airplanes |
Unsafe Condition
Failure of the refrigeration condenser fan with part number 6608059-3, which has blades not tapered in thickness from the hub to the tip.
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Required Actions
Before the next flight, inspect the refrigeration condenser fan part number. If part number 6608059-3 is installed, fabricate and install a placard restricting refrigeration system operation. Replace the fan with part numbers 6608059-1, -2, or -4 to remove the placard and return to normal service.
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Compliance Time
Before the next flight
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Affected Aircraft
Learjet Models 23 (SN 23-003+), 24/24A (SN 24-100-24-180), 24B/24B-A (SN 24-181-24-229), 24C/24D/24D-A (SN 24-218, 24-230-24-328), 24E/24F/24F-A (SN 24-329-24-356), 25/25A (SN 25-002-25-066), 25B/25C (SN 25-061, 25-067-25-201, 25-204-25-205), 25D/25F (SN 25-206-25-253), 35 (SN 35-001-35-066), 35A (SN 35-067-35-194), 36 (SN 36-001-36-017), and 36A (SN 36-018-36-040).
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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