AD NUMBER: 2007-09-03
SUBJECT: Airworthiness Directive 2007-09-03
SUMMARY: The FAA is adopting a new airworthiness
directive (AD) for certain Learjet Model 45 airplanes.
This AD requires deactivating the auxiliary power unit (APU),
capping/plugging the fuel lines to the APU, and removing the APU
fuel shutoff valve.
This AD results from reports of fuel leaking from the APU fuel
shutoff valve into a flammable fluid fire protection area that is
also interconnected with the main landing gear's wheel well
We are issuing this AD to prevent fuel leaking from the fuel
shutoff valve of the APU, which could result in an uncontrollable
fire and adversely affect the airplane's continued safe flight and