New upgrade for your Challenger 604 with Pro Line Fusion
Effectivity: Global 7500 aircraft
ATA 28
This article serves as an important reminder to operators of Global 7500 aircraft that it is important to follow the AMP procedure for the aircraft regarding Pressure refueling, reference BD700-A-J12-11-01-00AAA-211A-A, in order to prevent inadvertent failure of the Refuel Defuel Valves (RDV).
The Global 7500 aircraft refueling system for the wing and aft tank is equipped with Refuel/Defuel Valves (RDV) that are electrically controlled and pressure actuated. The refueling system for these tanks is dependent on the fuel pressure generated by the refueling truck pump to properly actuate the system valves. The centre tank RDV is operated by an electrical actuator. The centre RDV does not require any fuel pressure to be set to the closed or open position.
The FQMC does not monitor any external fuel pressure source such as the refueling truck pump incoming pressure. You can initiate the refueling on the Refuel Defuel Panel (RDP) by selecting the START switch in MANUAL or AUTO mode while the fuel truck pressure is not applied. This will cause the FQMC to receive an open command for the selected valve while the valve is still in the closed position due to the lack of fuel pressure.
In this condition, after a defined confirmation time, the FQMC considers the valve defective. The failure is annunciated on the RDP with a FAIL message on the affected tank quantity field. The FQMC will also post an OMS message not associated to any CAS nor INFO message.
As indicated in the AMP instruction, to ensure the proper operation of the valves, the fuel truck pump must supply a minimum pressure of 30 PSIG while not exceeding 55 PSIG. The RDV failure caused by a lack of pressure can be reset by selecting the RDP knob to the OFF position and back to the desired refuel mode.
Should you require more information, please contact your Bombardier Field Service Representative (FSR) or the Customer Response Centre (CRC) team 24/7 at 1-866-538-1247.