11/12/19
Message Overview:
| DDG Reference: | 33-51-01 |
| Pilot Action (QRH): | ABNORM 14-2 |
| System Description: | 33-51-00 |
| Schematic Diagram: | 33-51-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 33-51-01 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
DAU 1 and DAU 2 read OPEN at the status output from one or more than one Emergency Lighting Power Supply (ELPS).
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: None
Quick Links:
| Removal of Data Acquisition Units | AMM 31-42-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of Data Acquisition Units | AMM 31-42-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of Power supplies | AMM 33-51-09-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of Power supplies | AMM 33-51-09-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair | SPM 20-12-10 [ 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.
- 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).- If ANY ELPS is NOT posting TRUE-FALSE (GROUND-OPEN), continue with next step.
- If ALL ELPS are showing either TRUE-TRUE (GROUND-GROUND), FALSE-FALSE (OPEN-OPEN) or FALSE-TRUE (OPEN-GROUND), then go to step 5.
- 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?
- If YES, replace the defective ELPS.
- If NO, continue with next step.
- Swap DAU 1 with DAU 2. Interrogate CAIMS - DAU - Discrete inputs. Did the wrong discrete status follow the suspected DAU?
- If YES, replace the defective DAU.
- If NO, continue with next step.
- Perform a wiring check between the suspected ELPS and its source DAU and between the suspected ELPS and the EMER LIGHTS switch.
- If wiring defects are found, repair defective wiring as required and do close out.
- If no defects are found, continue with next step.
- Perform a continuity check of the EMER LIGHTS switch on the cockpit Emergency Lights Control Panel using wiring diagram 33-51-03.
- If wiring defects are found, repair defective wiring as required and do close out.
- If no defects are found, continue with next step.
- Perform a continuity check between the Emergency Lights Control Panel aircraft side connector and ground stud GS367.
- If wiring defects are found, repair defective wiring as required and do close out.
- If no defects are found, continue with next step.
- 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.
- Do close out.
