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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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06/30/21

Message Overview:

Message Name:

ALL NAV LIGHTS DO NOT ILLUMINATE

Message Code: 334OBS001
Effectivity: All
System: Navigation Lighting System
System Description: 33-42-00
Schematic Diagram: 33-42-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 33-42-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

All the Navigation Light do not come ON.

Possible Causes:

  • Navigation Light Control Panel (AP11)
  • Navigation Light Switch (S1)
  • Failure Indicator Box (A126)
  • Electrical Management System Control and Display Unit (EMS CDU) 1 (A94)
  • Electrical Management System Control and Display Unit (EMS CDU) 2 (A91)
  • Secondary Power Distribution Assembly (SPDA) 3 (A15)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Secondary-Power Distribution Assemblies AMM 24-62-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Secondary-Power Distribution Assemblies AMM 24-62-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Electrical Management System Control-and-Display Units (EMS CDU) AMM 24-70-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Electrical Management System Control-and-Display Units (EMS CDU) AMM 24-70-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Failure Indicator Box AMM 33-42-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Failure Indicator Box AMM 33-42-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Make sure the aircraft power is not set to "Ground service" mode and set the NAV light switch to ON.
  2. Record label and bits status through the EMS CDU Signboard menu as follows:

    1. Select SYSTEM - CNTL key
    2. Select lower left Line Select Key (LSK)
    3. Select lower right LSK
    4. Select "SPDA 3 IN"
    5. Record label 046

      Left Column Center Column
      29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14
      046

  3. Examine bits 29, 26, 25, 24, 23 and 22.

    1. If bits 26, 25, 24, 23 or 22 are set to "0", go to step 6.
    2. If bit 29 is set to "1", go to step 9.
    3. If bits 26, 25, 24, 23 or 22 are set to "1", continue with next step.

  4. Disconnect the NAV lights control and indication unit connector A126P1. Check the 28 VDC power input from SPDA 3 as follows:

    From To Expected Result Result
    A126P1-A A126P1-P 28 VDC

    1. If there is no 28 VDC, repair or replace the defective wiring as required and do close out.
    2. If there is 28 VDC, continue with next step.

  5. Replace NAV light indicator unit.

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

  6. The SPDA is not supplying power. Swap SPDA 3 with SPDA 4. Is the fault still present?

    1. If NO, replace SPDA 3 and do close out.
    2. If YES, continue with next step.

  7. Disconnect EMS CDU 1 connector A94P1 and EMS CDU 2 connector A91P1. Perform a continuity check between EMS CDU and ground as follows:

    From To Result
    A94P1-49 Ground
    A91P1-49 Ground

    1. If there is continuity, repair or replace the defective wiring as required and do close out.
    2. If there is no continuity, continue with next step.

  8. Perform a continuity check between the EMS CDUs and SPDA 3 as follows and repair defective wiring as required

    From To Result
    A91P1-7 A15P6-1
    A91P1-8 A15P6-2
    A94P1-7 A15P5-1
    A94P1-8 A15P5-2

    1. If there is no continuity, repair or replace the defective wiring as required and do close out.
    2. If there is continuity, continue with next step.

  9. Replace defective EMS CDU.
  10. Do close out.

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