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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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08/07/23

Message Overview:

CTR TANK FULL
(Caution)

DDG Reference: 28-41-01
Effectivity: Global 5000
Pilot Action (QRH): None
System Description: 28-41-00
Schematic Diagram: 28-41-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 28-41-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

This CAS message is for the Global 5000 only

The CTR TANK FULL (Caution) CAS message will illuminate at a fuel level greater than 1000 gallons. The message will extinguish when fuel level is less than 975 gallons.Center fuel tank compensating probe TU3 is responsible for the shut-off of fuel coming into the fuel tank.

Global 5000 aircraft fuel shut-off level is limited to 875.3 gallons, if the fuel shutoff valve fails and the fuel level reaches 1000 gallons then the CTR TANK FULL (Caution) CAS message will be illuminated and the Center tank fuel quantity indication will be displayed in AMBER on the fuel and engine synoptic pages.

Possible Causes:

  • Fuel Compensating Probe (TU3) (C25)
  • Refueling Shut-off Valve (L7)
  • Fuel Management and Quantity Gauging System (FMQGC) (A47)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Fuel Quantity Probes With Compensator AMM 28-41-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Fuel Quantity Probes with compensator AMM 28-41-05-400-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational test of the fuel quantity probes AMM 28-41-00-760-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Cleaning of the Fuel Management and Quantity Gauging System (FMQGC) Components AMM 28-41-00-110-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Fuel Computer (FMQGC) AMM 28-41-01-000-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the fuel computer (FMQGC) AMM 28-41-01-400-801  [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Repairs SPM 20-12-10-02  [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

CTR TANK FULL (Caution) CAS message displays after pressure/gravity refueling

  1. Is the fuel quantity greater than 1000 gallons for the center fuel tank?

    1. If YES then verify that the fuel quantity readings are accurate. Calculate how much fuel the truck pumped into the aircraft. If the quantity readings are accurate then go to step 6.
    2. If NO then continue with the next step.

  2. Is the fuel quantity reading less than 875 gallons or 5,906 lbs.

    1. If YES then go to step 6.
    2. If NO then go to next step.

  3. Gain access to the FMQGC and remove it.
  4. Inspect the unit, tray, connectors and pins.

    1. If the FMQGC rack and unit visually looks OK then go to next step.
    2. If the FMQGC visually is damaged and or rack and pins, repair or replace unit or wiring.

  5. Re-install the FMQGC. Does the CTR TANK FULL (Caution) CAS message still display?

    1. If YES then go to next step.
    2. If NO then do close out.

  6. Perform the capacitance test of the CTR fuel quantity probes per (AMM 28-41-00-760-801). Does the CTR tank fuel quantity probes pass the test?

    1. If YES then suspect the fuel shutoff valve (L7).
    2. If NO then continue with the next step.

  7. Perform a continuity check of the wiring from the FMQGC to the fuel probe (C25). Remove FMQGC from the tray and remove connectors CTP1 and CTP2.
    NOTE: Inspect contacts and wiring fro contamination or damage. You may shake/move the wiring while performing continuity checks to detect any intermittent connection.

    FROM TO RESULT
    CTP1 pin 11 GND GND/Continuity
    CTP1 pin 11 Shield OPEN
    CTP1 pin 9 GND GND/Continuity
    CTP1 pin 9 Shield OPEN
    CTP2 GND GND/Continuity
    CTP2 Shield OPEN

    1. If the wiring check is good, continue with the next step.
    2. If the wiring check is not good, repair defective wiring as required.

  8. Re-install the FMQGC and re-connect CTP1, CTP2.
  9. Gain access to the fuel probe (C25).
  10. Defuel aircraft as necessary.
  11. Remove connectors CTJ2 and CTJ1. Inspect the connectors for fuel and general condition.

    1. If the connectors are OK then go to next step.
    2. If the connectors are at fault then repair or replace the connectors and wiring as necessary.

  12. Inspect fuel probe (C25).

    1. If the fuel probe is clean then continue with the next step.
    2. If the fuel probe is dirty or contaminated then clean the probe per AMM 28-41-00-110-801 Replace if necessary.

  13. Suspect the FMQGC if above checks are OK.
  14. Do close out.

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