AD 2003-19-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet | 60 | Airworthiness Directives; Learjet Model 60 Airplanes |
Unsafe Condition
Chafing and consequent failure of the fuel crossflow tube due to inadequate clearance between the tube and the flight control cables, which could result in loss of fuel from one fuel tank during normal operating conditions or loss of fuel from both main fuel tanks during fuel cross-feeding operations.
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Required Actions
Inspect the fuel crossflow tube to determine whether part number (P/N) 6026020-005 is installed. If P/N 6026020-005 is found installed, measure the clearance between the fuel crossflow tube and the flight control cables to ensure it is at least 0.35 inch. If the clearance is less than 0.35 inch, repair the tube per a method approved by the Manager, Wichita Aircraft Certification Office (ACO), FAA. If P/N 6026020-005 is not found installed, replace the existing fuel crossflow tube with a new one having P/N 6026020-005, and measure the clearance between the newly installed tube and the flight control cables. If the clearance is less than 0.35 inch, repair the tube as required.
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Compliance Time
Within 25 flight hours after the effective date of this AD for inspection/review; before further flight for clearance measurement and repair; within 90 days after inspection/review for replacement and clearance measurement.
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Affected Aircraft
Learjet Model 60 airplanes, serial numbers 60-001 through 60-145 inclusive, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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