07/01/21
Message Overview:
Message Name:
HEAD-UP-DISPLAY (HUD) CONTROL PANEL INOPERATIVE
| Message Code: | 343OBS002 |
| Effectivity: | Post SB 700-34-002 and 9140 and Subs |
| System: | Head-Up-Display (HUD) System |
| System Description: | 34-32-00 |
| Schematic Diagram: | 34-32-00 [ Global Express ] [ G5000 ] [ GlobalXRS ] |
| Wiring Diagram: | 34-32-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Message Description:
The Head-Up-Display (HUD) Control Panel does not control the power to the HUD Computer or does not provide variable intensity through the HUD DIM/BRT control.
Possible Causes:
- Head-Up Flight Display Computer (HFDC) (A250)
- Glareshield LH Push Button Annunciator (PBA) Control Panel (AP15)
- Rotary Switch/Potentiometer (S1/R49)
- Jubnction Box (JB4)/PCB4
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- SB 700-34-002 - Modification-Head-Up Display System - Installation
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Removal of the Rotary Switch/Potentiometer | AMM 20-11-01-000-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Rotary Switch/Potentiometer | AMM 20-11-01-400-802 [ Global Express ] [ G5000 ] [ Global XRS ] |
| 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 Junction Box JB4 | AMM 24-00-05-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Junction Box JB4 | AMM 24-00-05-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Junction Box JB4 Circuit-Cards | AMM 24-00-06-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Junction Box JB4 Circuit-Cards | AMM 24-00-06-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the MASTER WARNING/CAUTION Panel | AMM 31-52-13-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the MASTER WARNING/CAUTION Panel | AMM 31-52-13-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Operational Test of the Head-Up-Display (HUD) System | AMM 34-32-00-710-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Head-Up-Display (HUD) Computer | AMM 34-32-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Head-Up-Display (HUD) Computer | AMM 34-32-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the External Avionics-Compartment Access-Panel (140BB) |
AMM 52-45-11-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the External Avionics-Compartment Access-Panel (140BB) |
AMM 52-45-11-400-801 [ 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:
- Remove the LH MASTER WARNING/CAUTION panel and HUD computer to gain access to GLARESHIELD L/H PBA CONTROL PANEL connector (AP15P2) and HEAD-UP FLIGHT DISPLAY COMPUTER (A250FP1). Perform a continuity check as follows:
From To Result AP15P2-4 A250FP1-4 - If there is continuity, go to step 4.
- If there is no continuity, repair defective associated wiring as required and continue with next step.
- Remove the JB4 to get access to JUNCTION BOX 4 connector (JB4BP1). Perform a continuity check as follows:
From To Result JB4BP1-18 JB4BP1-19 JB4BP1-18 JB4BP1-20 - If there is no continuity, repair the defective wiring as required and continue with next step.
- If there is continuity, replace the JB4 circuit card PCB4 and continue with next step.
- Install the JB4 junction box, MASTER WARNING/CAUTION panel and the HUD computer. Perform the operational test of the HUD system.
- If the operational test is satisfactory, do close out.
- If the operational test is not satisfactory, continue with next step.
- Perform a continuity check as follows:
From To Result AP15P2-6 GS1028 - If there is continuity, repair or replace the defective wiring as required and do close out.
- If there is no continuity, continue with next step.
- Rotate the switch from the OFF position. Perform a continuity check as follows:
From To Result AP15J2-6 AP15J2-4 - If there is no continuity, go to step 8.
- If there is continuity, continue with next step.
- Check if the head-up-display (HUD) control panel provide variable intensity through the HUD DIM/BRT control.
- If the HUD control panel provides the variable intensity, do close out.
- If the HUD control panel does not provide the variable intensity, continue with next step.
- Remove the LH MASTER WARNING/CAUTION panel to gain access to connector (AP15P2), disconnect the connector (A251P2) for the HUD optical projector unit. Perform a continuity check for an open circuit or a short circuit to ground between the connectors GLARESHIELD L/H PBA CONTROL PANEL (AP15P2) and OPTICAL PROJECTOR UNIT (A251P2).
From To Result AP15P2-3 A251P2-11 AP15P2-1 A251P2-2 AP15P2-2 A251P2-1 - If there is no continuity, repair the defective wiring as required and do close out.
- If there is continuity, continue with next step.
- Replace the defective rotary switch/potentiometer (S1/R49).
- Do close out.