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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:

NOSE GEAR LANDING LIGHTS UNSERVICEABLE

Message Code: 334OBS010
Effectivity: All
System: Landing and Taxi Lighting
System Description: 33-41-00
Schematic Diagram: 33-41-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 33-41-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

Nose Gear Landing Light or Lights do not come ON.

Possible Causes:

  • External Lights Control Panel (AP11)
  • Nose Landing Gear (NLG) Light bulb
  • Left Nose Landing Gear (NLG) Light (DS28)
  • Right Nose Landing Gear (NLG) Light (DS29)
  • Nose Landing Gear (NLG) Switch (S7)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Connect Electrical Power to the Aircraft AMM 24-00-00-861-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Remove the Electrical Power from the Aircraft AMM 24-00-00-861-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Opening of Non-Thermal Circuit Breakers AMM 24-00-00-863-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Closing of Non-Thermal Circuit Breakers AMM 24-00-00-863-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Electrical/Electronic Safety Precautions AMM 24-00-00-910-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Position Indication System AMM 32-61-00-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the EXTERNAL LIGHTS Control Panel AMM 33-40-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the EXTERNAL LIGHTS Control Panel AMM 33-40-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Nose-Gear Landing Lights AMM 33-41-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Nose-Gear Landing Lights AMM 33-41-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Replacement of the Nose-Gear Landing Light-Bulb AMM 33-41-05-960-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Nose-Gear Landing Lights AMM 33-41-05-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Safety Precautions - Maintenance Practices - ALL SPM 20-00-01-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Set the NLG light switch to ON.

    1. If both NLG landing lights do not comes on, replace the EXTERNAL LIGHTS Control Panel and do close out.
    2. If only one of the two NLG landing light does not come on, continue with next step.

  2. Measure the voltage at the applicable connectors that follow:

    From To Expected Result Result
    DS29P1-A DS29P1-B 115 VDC
    DS28P1-A DS28P1-B 115 VDC

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

  3. Replace the bulb of the applicable unserviceable nose gear landing light.

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

  4. Replace the Nose Gear Landing Light.
  5. Do close out.

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