AD 2005-16-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet | 23 | Airworthiness Directives; Learjet Model 23, 24, 25, 35, and 36 Airplanes |
Unsafe Condition
Imbalance of the fuel loads in the wings of the airplane due to deterioration of the flappers of the tip tank, which could result in significant reduction in the lateral control of the airplane.
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Required Actions
Inspect the flappers and flapper assemblies of the tip tank in each wing or review the airplane maintenance records to determine the part numbers. Replace certain flappers or flapper assemblies if necessary, which ends the existing repetitive inspections.
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Compliance Time
Within 50 hours time-in-service after December 27, 1995, or prior to the accumulation of 600 hours time-in-service since installation of the flapper valve, whichever occurs later.
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Affected Aircraft
Learjet Model 23 (serial numbers 23-003 through 23-090), Model 24 (serial numbers 24-100 through 24-357), Model 25 (serial numbers 25-002 through 25-373), Model 35 (serial numbers 35-002 through 35-676), and Model 36 (serial numbers 36-002 through 36-063).
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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