AD 89-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24A | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24B | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24B-A | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24C | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24D | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24D-A | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24E | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24F | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24F-A | Airworthiness Directives; Learjet Model 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
Unsafe Condition
Failure of drag chute upon deployment due to riser manufactured prior to May 1987.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine the drag chute riser's manufacture date using specified service bulletins. Replace riser with new part number 6600180-16 or earlier dated riser, or install placard stating 'DRAG CHUTE INOPERATIVE' if riser is pre-May 1987. Perform drag chute control system adjustment and functional test after reidentification or replacement.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 10 hours time-in-service or 2 calendar weeks after the effective date of this AD, whichever occurs first
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Affected Aircraft
Learjet Model 24 (24-100 through -357), 25 (25-003 through -373), 28 (28-001 through -005), 29 (29-001 through -004), 35 (35-001 through -646), 36 (36-001 through -058), and 55 (55-001 through -134) series airplanes.
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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