AD 2016-20-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
Unsafe Condition
Potential chafing condition exists between the negative-G fuel feed drain line of the auxiliary power unit (APU) and its surrounding structure and components, which could result in fuel leaking from the drain line. This condition, in combination with a nearby hot surface or other potential ignition source, could result in an uncontrolled fire in the aft equipment bay.
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Required Actions
For certain airplanes, a detailed inspection for chafing conditions of the negative-G fuel feed drain line of the APU is required, with corrective actions if necessary. For certain other airplanes, replacement of the APU negative-G fuel feed tube assembly and the drain line is required.
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Compliance Time
Within 12 months of the effective date (January 9, 2017)
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Affected Aircraft
Bombardier, Inc. Model CL-600-2A12 (CL-601 Variant) airplanes with serial numbers 3001 through 3066, and Model CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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