FUEL QTY DEGRADED
(Advisory)

The total fuel quantity accuracy is degraded when it can not be assured to be within 1% of the full scale of the total fuel qty.

• Fuel Management and Quantity Gauging Computer (FMQGC) cannot detect fuel density after power up for 60 seconds
• There are multiple sensor failures (i.e. no working compensators or over half of the Fuel Probes in a tank failed)
• The pitch of the aircraft is less than -13 degrees or more than 24 degrees for 60 seconds or longer
• The aircraft roll angle is less than -5 degrees, or more than 5 degrees for 60 seconds or longer
• The calculated fuel quantity output for any tank from channel A of the FMQGC disagrees from the calculated output from channel B of the FMQGC by at least 1% of the full scale tank quantity for 60 seconds
• Only for A/C with a Forward Tank installed: Both Probes in the Forward Tank have failed while the Center Tank is not empty
• Message is displayed 3 minutes after the completion of the refueling operation.
• Switching the Refuel/Defuel Control Panel (RDCP) to OFF prior to completion of refueling.

• Secondary-Power Distribution Assembly (SPDA) 2 (A14)
• Secondary-Power Distribution Assembly (SPDA) 3 (A15)
• Left Densitometer (A163)
• Left Compensator (CMPL) (C7)
• Fuel Management and Quantity Gauging Computer (FMQGC) (A47)
• Compensator Fuel Quantity Probe (C25)
• Compensator Fuel Quantity Probe (C28)
• Wing Tank Fuel Quantity Probe (C27)
• Wing Tank Fuel Quantity Probe (C29)
• Forward Tank Fuel Quantity Probes
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW700-28-0496 - Fuel Quantity Indication Fluctuation
• AW700-28-0185 - "FUEL QTY DEGRADED" EICAS Message

Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM):

•  [ Global Express ]  [ G5000 ]  [ Global XRS ] FON 01-13 FUEL-001, [FUEL QTY DEGRADED] (Advisory/Cyan) Message During Refueling

NOTES:

• If the message is displayed on the ground freshly after replacing the FMQGC, perform a refueling session to trigger the FMQGC to acquire the fuel density data from the Densitometer in the left wing.
• The message may also be displayed if the forward fuel tank is installed, the center tank is empty and a dual failure of the forward tank fuel probes is detected.
• As viewed in CAIMS, the Probe Status "GOOD PROBE" indicates the probe is communicating with FMQGC and the probe is reporting a capacitance within a nominal range (between full dry and full wet). The OMS may report the Probe Status as "GOOD PROBE", yet a dry capacitance check per the AMM may find a probe out of AMM limits. The only way to verify if a probe is reporting accurately is to do the Dry Capacitance check IAW AMM task 28−41−00−760−801 Capacitance Test of the Fuel Quantity Probes.
  

1. Is the "FUEL QTY DEGRADED" CAS message displayed on the ground after the completion of the refueling operation?

   1. If YES, continue with next step.
   2. If NO, go to step 3.

2. Attempt to clear the CAS message as follows:

   • If battery power is in use, power down the FMQGC by selecting the MANUAL/AUTO mode selector switch to "OFF".
   • If other power sources are in use, power down the FMQGC by using the EMS CDU to set the FUEL COMPUTR CH A and CH B circuit breakers to OUT.
   • Wait 5 seconds and set the circuit breakers back to IN.

3. Make sure the A/C was not in an attitude (pitch or roll) condition described in the Message Description:. If it was, monitor over the next flight in normal flight conditions.
4. Access CAIMS Active Faults and select displayed message from menu below:
   Select an Item284466BPK - CMPL FMQGS COMPENSATOR/WRG FAULT284466CPK - LHDENS DENSITOMETER/WRG FAULT
5. If none of these messages are displayed in the OMS, look for messages for the various probes in the different tanks also. If no messages are present, continue with next step.
6. Do a dry capacitance test of the fuel probes and record values on the following data entry form and repair as required.
7. Do close out.