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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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07/17/23

Message Overview:

Message Name:

OPN/SHRT/OUT OF RANGE

Message Code:

B3-007142

Associated CAS:

None

Reporting LRU: L TNK HI LVL
System Description: 28-41-00
Schematic Diagram: 28-41-00
Wiring Diagram: 28-41-17

Message Description:

This maintenance message is generated by the Fuel Quantity Gauging Computer (FQGC) and no EICAS message is associated with it. This fault will prevent automatic and manual pressure refueling.

NOTE: Extremely low ambient temperature (below -40°C (-40°F)) can create a false high level indication or trigger a fault.

Possible Causes:

  • High Level Sensor (HLS) (LH) (MT15)
  • Fuel Quantity Gauging Computer (FQGC) (A57)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • SB100-28-07 - SPECIAL CHECK/MODIFICATION - Fuel Management and Quantity Gauging System (FMQGS) - Fuel Wing Tanks High Level Sensor Connector

Forum Articles/Infoservice/Newsletter: None

If HLS found to be defective by the FQGC, automatic and manual refueling will not be possible. If outside temperature is very cold and refueling is impossible due to one or both Hi Level sensors drifting out of nominal value, heating up the Hi Level sensor could temporarily solve this type of failure.

Quick Links:

Pressure Refueling AMM 12-11-01-650-801
Suction Defueling AMM 12-11-09-650-801
Drain Water from the Fuel Tank AMM 28-10-00-680-801
Built-In Test of the Fuel-Quantity Gauging System AMM 28-41-00-740-801
Removal of the Fuel Quantity Computer AMM 28-41-01-000-801
Installation of the Fuel Quantity Computer AMM 28-41-01-400-801
Removal of the Fuel Quantity Probe AMM 28-41-13-000-801
Installation of the Fuel Quantity Probe AMM 28-41-13-400-801
Capacitance Check of the Fuel Quantity Probes AMM 28-41-13-760-801
Cleaning of the Fuel Quantity Probes AMM 28-41-13-160-801
Removal of the High Level Sensor AMM 28-41-17-000-801
Installation of the High Level Sensor AMM 28-41-17-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. If the ambient temperature is extremely low (below -40°C (-40°F)), bring the aircraft inside or wait for temperature to rise. If the message disappears, there is no fault with the system.
  2. Interchange left and right High Level Sensors.

    1. If fault follows, replace sensor.
    2. If fault does not follow, go to next step.

  3. Check wiring between FQGC (A57) and left High Level Sensor (MT15).
  4. If wiring is found serviceable, go to next step.
  5. Re-rack the Fuel Quantity Gauging Computer (FQGC). Is the fault message still present?

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

  6. If fault continues, replace FQGC.
  7. Do close out.

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