06/30/21
Message Overview:
Message Name:
PHONE LIGHT UNSERVICEABLE
| Message Code: | 331OBS012 |
| Effectivity: | All |
| System: | Miscellaneous Lighting |
| System Description: | 33-13-00 |
| Schematic Diagram: | 33-13-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 33-13-01 [ Global Express ] [ G5000 ] [ Global XRS ] |
Message Description:
Phone Light or Lights do not come on.
Possible Causes:
- Phone Light Bulb
- Left Phone Light (DS39)
- Right Phone Light (DS40)
- Floor Lights Switch (S5)
- 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 ] |
| Removal of the COCKPIT LIGHTS (INTEGRAL) Control Panel |
AMM 33-11-09-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the COCKPIT LIGHTS (INTEGRAL) Control Panel |
AMM 33-11-09-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Operational Test of the Floor/Phone Lights | AMM 33-13-00-710-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Phone Lights | AMM 33-13-13-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Phone Lights | AMM 33-13-13-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Replacement of the Phone Light Bulb | AMM 33-13-13-960-801 [ 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:
- Set the Floor light switch to ON on the Cockpit Lights (Integral) control panel. Measure the voltage at the connectors that follow:
For the LH phone light (DS39):From To Expected Result Result DS39P1-1 DS39P1-2 (Ground) +28 VDC For the RH phone light (DS40):
From To Expected Result Result DS40P1-1 DS40P1-2 (Ground) +28 VDC - If there is no voltage, go to step 4.
- If there is voltage, continue with the next step.
- Replace the bulb of the phone light and perform the operational test.
- If the bulb of the phone light operates, do close out.
- If the bulb of the phone light does not operate, continue with the next step.
- Replace the phone light and perform the operational test.
- If the phone light operates, do close out.
- If the phone light does not operate, continue with next step.
- Disconnect the INTEGRAL & MISCELLANEOUS LIGHTS COCKPIT CONTROL PANEL connectors (AP26P1 and AP26P2). Perform a continuity check between the pins of the connectors PHONE LT STN 265 LHS (DS40) and INTEGRAL & MISCELLANEOUS LIGHTS COCKPIT CONTROL PANEL (AP26P2) or PHONE LT STN 265 RHS (DS39) and INTEGRAL & MISCELLANEOUS LIGHTS COCKPIT CONTROL PANEL (AP26P1) as follows:
For the LHS phone light:From To Result DS40-TBB3705 AP26P2-21 DS40-TBB3706 GS556 For the RHS phone light:
From To Result DS39-TBC3714 AP26P1-21 DS39-TBC3716 GS559 - If there is no continuity, repair or replace defective wiring as required. Connect the applicable phone light (DS39 or DS40) and connect the disconnected connectors AP26P1 to RHS phone light and AP26P2 to LHS phone light and do close out.
- If there is continuity, continue with next step.
- Perform the troubleshooting for 331OBS002 - COCKPIT LIGHTS (INTEGRAL) CONTROL PANEL MALFUNCTION.
- Do close out.