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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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07/19/19

Message Overview:

Fault Message:

DENSITOMETER/WRG

Fault Code:

284466CPK

Associated CAS:

FUEL QTY DEGRADED
(Advisory)

Reporting LRU: Fuel Management and Quantity Gauging Computer (FMQGC)
System Description: 28-41-00
Schematic Diagram: 28-41-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 28-41-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

LHDENS DENSITOMETER/WRG FAULT is displayed on the CAIMS PMAT when the Densitometer or interface is out of range or unable to acquire fuel density.

Possible Causes:

  • Left Densitometer (A163)
  • Fuel Management Quantity and Gauging Computer (FMQGC) (A47)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

LHDENS DENSITOMETER/WRG FAULT message logic details:

The FMQGC carries out validation checks when the aircraft is WOW. If one of the following check fails for more than 30 seconds, a fault is logged in the NVM.

  1. FMQGC does not detect a calibration coefficient (density).
  2. Densitometer coefficient validation test failed.
  3. FMQGC densitometer oscillation range test failed when the densitometer is submerged in fuel.
  4. Acquired fuel density value is not within a valid range, between 5.01 to 7.52 pounds per gallon, when the densitometer is fully submersed in the fuel and the aircraft is WOW.
  5. If the densitometer fails before acquiring density after each refuel. For this condition, the FUEL QTY DEGRADED (Advisory) CAS message will be posted.

Quick Links:

Removal of the Computer AMM 28-41-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Computer AMM 28-41-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Densitometer AMM 28-41-21-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Densitometer AMM 28-41-21-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Access to CAIMS and check for LH DENSITOMETER density and status values when there is fuel in the LH wing and the aircraft is WOW:

    • Density value should be within range (between 5.01 to 7.52 pounds per gallon)
    • Status values should be: Good Sensor, unable to acquire or out of range

    1. If density value and status value are within range, go to step 4.
    2. If density value and status value are out of range, continue with next step

  2. Perform wiring checks between FMQGC (A47EP1)/(A47AP1) and Densitometer (A163P1).

    1. If wiring checks are not good, repair defective wiring as required and go to step 4.
    2. If wiring checks are good, continue with next step.

  3. Replace the Densitometer.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  4. Re-rack the FMQGC making sure it is fully and properly pushed into place. Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  5. Replace the FMQGC.
  6. Do close out.

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