AD 80-19-09 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 23 | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 24A | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 24B | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 24B-A | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 24C | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 24D | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 24D-A | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 24E | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
| aircraft | Learjet Inc. | 24F | Airworthiness Directives; Gates Model 23, 24, 25, 28, 29, 35 and 36 Series Airplanes |
Unsafe Condition
Fuel contamination and ignition sources in the tailcone service area due to deterioration, damage, leakage, or blockage of fuel, hydraulic system components, batteries, electrical equipment, vents, and drains.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 25 hours time-in-service after May 8, 1980: inspect fuel/hydraulic components, batteries, electrical equipment, vents, and drains for deterioration, damage, leaks, stains, or blockages; replace leaking motive flow shutoff valves. Install updated Temporary Airplane Flight Manual Supplement (Figure 1A). By February 13, 1981, install motive flow valve shrouds and drain lines per Modification Kit No. AMK 80-7. Remove temporary supplement after modification.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours time-in-service after May 8, 1980 for initial inspections and replacements; on or before February 13, 1981 for installation of shrouds and drain lines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Gates Learjet Model 23 (equipped with jet pumps, serial 23-003-23-099), 24 (24-100-24-357), 25 (25-003-25-319), 28 (28-001-28-005), 29 (29-001-29-002), 35 (35-001-35-348), and 36 (36-001-36-045).
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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