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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:

ONE OR MORE EMERGENCY LIGHTS INOPERATIVE

Message Code: 335OBS003
Effectivity: All
System: Emergency Lighting System
System Description: 33-50-00
Schematic Diagram: 33-51-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 33-51-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

One or few emergency lights are inoperative when the emergency light switch is set to on.

Possible Causes:

  • Cockpit EMER LIGHTS Switch (AP13-S1)
  • Emergency Light Power Supply (ELPS) (A158)
  • Emergency Light Power Supply (ELPS) (A159)
  • Emergency Light Power Supply (ELPS) (A160)
  • Emergency Light Power Supply (ELPS) (A161)
  • Data Acquisition Unit (DAU) 1 (A17)
  • Data Acquisition Unit (DAU) 2 (A18)
  • Secondary Power Distribution Assembly (SPDA) 4 (A16)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:

Quick Links:

Removal of the Emergency Lighting Power Supplies (ELPS) AMM 33-51-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Emergency Lighting Power Supplies (ELPS) AMM 33-51-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Replacement of the Internal Battery of the Emergency Lighting Power Supplies (ELPS) AMM 33-51-09-960-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Emergency Lighting Power-Supplies AMM 33-51-09-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Functional Test of the Emergency Lights Power-Supplies AMM 33-51-09-720-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Replacement of the Internal fuses of the Emergency Lighting Power Supplies (ELPS) AMM 33-51-09-960-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

CAUTION: DO NOT OPERATE THE INTERNAL AND EXTERNAL LIGHTING FOR MORE THAN 10 MINUTES. CONTINUED OPERATION WILL DECREASE THE CHARGE OF THE BATTERIES OF THE EMERGENCY LIGHTING POWER-SUPPLIES.

  1. Access to CAIMS and select SYSTEM DIAG. Interrogate DAU 1 and DAU 2 - LRU test - Discrete inputs as follows:Record and compare the ELPS 1, 2, 3 & 4 ELPS Status 1 & 2 against the following ELPS truth table.
    NOTE: With the EMER LIGHTS switch to ARM, ALL ELPS status #1 should be TRUE (Ground) and all ELPS status #2 should be FALSE (Open).

    1. If ANY ELPS is NOT posting TRUE-FALSE (GROUND-OPEN), continue with next step.
    2. If ALL ELPS are showing either TRUE-TRUE (GROUND-GROUND), FALSE-FALSE (OPEN-OPEN) or FALSE-TRUE (OPEN-GROUND), then go to step 5.
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  2. If any of the ELSP is posting a wrong discrete input to the DAU, swap the suspected ELPS with another ELPS. Interrogate CAIMS - DAU - Discrete inputs. Did the wrong discrete status follow the suspected ELPS?

    1. If YES, replace the defective ELPS.
    2. If NO, continue with next step.

  3. Swap DAU 1 with DAU 2. Interrogate CAIMS - DAU - Discrete inputs. Did the wrong discrete status follow the suspected DAU?

    1. If YES, replace the defective DAU.
    2. If NO, continue with next step.

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  4. Perform a wiring check between the suspected ELPS and its source DAU and between the suspected ELPS and the EMER LIGHTS switch.

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no defects are found, continue with next step.

  5. Perform a continuity check of the EMER LIGHTS switch on the cockpit Emergency Lights Control Panel using wiring diagram 33-51-03.

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no defects are found, continue with next step.

  6. Perform a continuity check between the Emergency Lights Control Panel aircraft side connector and ground stud GS367.

    1. If wiring defects are found, repair defective wiring as required and do close out.
    2. If no defects are found, continue with next step.

  7. Perform a continuity check between the Emergency Lights Control Panel aircraft side connector and the Terminal Module(s) (check wiring diagram for effectivity). Repair as required.
  8. Do close out.

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