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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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07/14/23

Message Overview:

Message Name:

NO L-GP-5 BUS INPUT

Message Code:

B3-006790

Associated CAS:

None

Reporting LRU: FQGC
System Description: 28-41-00
31-45-00
Schematic Diagram: 28-41-00
31-45-00
Wiring Diagram: 28-41-01
31-45-06

Message Description:

Fuel Quantity Gauging Computer has no ARINC input from L GP-5 bus.

Possible Causes:

  • Junction Box 1 (JB1)
  • Junction Box 2 (JB2)
  • Left Input/Output Concentrator (IOC) (A4-IOC1)
  • Fuel Quantity Gauging Computer (FQGC) (A57)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

If the MDC message 'No L-GP-5 Input' is in the Fault Message History (FMH) and FQGC BIT passes, this should be considered a transitory condition.

Quick Links:

Pressure Refueling AMM 12-11-01-650-801
Suction Defueling AMM 12-11-09-650-801
Removal of the Junction Box JB2 AMM 24-63-05-000-803
Installation of the Junction Box JB2 AMM 24-63-05-400-803
Functional Test of the Junction Box JB2 AMM 24-63-05-720-801
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 Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
Operational Test of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-710-801
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. Make sure the Refuel/Defuel panel is set to OFF and reset CB3-C3 (FUEL QTY 1), CB4-C3 (FUEL QTY 2), CB1-B6 (L IAPS), waiting 10 seconds before pushing the breakers back.

    1. If fault is no longer in the Current Fault report, no other action is necessary.
    2. If fault is still present, go to next step.

  2. Verify if other LRUs have reported a missing ARINC input from L GP-5 bus.

    1. If YES, troubleshoot L IOC card.
    2. If NO, go to next step.

  3. Interchange IOC cards.

    1. If fault follows, replace faulty IOC card.
    2. If fault remains, re-install IOC cards to their original position and go to next step.

  4. Carry out wiring checks.

    FROM TO EXPECTED RESULTS:
    FQGC A57BP1 pin 77 JB1 JB1AP1 pin F7 Continuity
    FQGC A57BP1 pin 91 JB1 JB1AP1 pin G7 Continuity

    1. If wiring defects are found, repair/replace as required.
    2. 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. Replace FQGC.
  7. Do close out

60_lh_secondary_cb_pnl60_rh_secondary_cb_pnl40_iaps_fuel_quantity_block

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