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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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07/01/21

Message Overview:

Message Name:

LIGHTNING SENSOR SYSTEM TRANSMIT INHIBIT FUNCTION DOES NOT OPERATE

Message Code: 344OBS012
Effectivity: 9140 and SUBS and POST SB 700-34-003
System: Lightning Sensor System
System Description: 34-47-00
Schematic Diagram: 34-47-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 23-51-51 [ Global Express ]  [ G5000 ]  [ Global XRS ]
34-47-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

The transmit inhibit function of the Lightning Sensor System (LSS) does not operate.

Possible Causes:

  • Lightning Sensor Processor (A224)
  • Lightning Sensor System (LSS) Antenna (E55)
  • Audio Panel 1 (A8)
  • Audio Panel 2 (A9)
  • Audio Panel 3 (A215)
  • Lightning Sensor System (LSS) Relay (K1)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • SB700-23-002 - Modification-Third Very High Frequency (VHF 3) Communication System-Installation
  • SB700-34-003 - Modification-Lightning Sensor System (LSS) System-Installation

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Audio Panels AMM 23-51-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Audio Panels AMM 23-51-05-400-801 [ 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 JB3 Circuit-Cards AMM 24-00-02-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Junction Box JB3 Circuit-Cards AMM 24-00-02-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Lightning Sensor System AMM 34-47-00-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Lightning-Sensor System Processor AMM 34-47-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Lightning-Sensor System Processor AMM 34-47-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Lightning-Sensor System Antenna AMM 34-47-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Lightning-Sensor System Antenna AMM 34-47-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Lightning-Sensor System Relay AMM 34-47-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Lightning-Sensor System Relay AMM 34-47-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to Active Faults AMM 45-45-00-970-802 [ 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 ]
Removal of the Top Mid-Fairing of the Bullet Fairing (346BT) AMM 55-10-05-000-802 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Top Mid-Fairing of the Bullet Fairing (346BT) AMM 55-10-05-400-802 [ 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. Remove the applicable audio panel(s) and the cover from the junction box JB3 to get access to the circuit card. Perform a continuity check for open circuits between the pins of LSS PROCESSOR connector (A224BP1), JB3, PCB5, LSS RELAY (K34), SPDA 3 connector (A15P2), AUDIO PANEL 1 connector (A8P1), AUDIO PANEL 2 connector (A9P1) and AUDIO PANEL 3 connector (A215P1) as follows:
    For the LSS processor (A224):

    From To Result
    A224BP1-24 JB3/PCB5/K34-A1
    A224BP1-25 JB3/PCB5/K34-A2
    JB3/PCB5/K34-X1 A15P2-H

    For the audio panel 1 (A8):
    NOTE: This interface contains a diode. Set the multimeter to the diode test position and take the measurements with the polarities shown.

    From To Resistance Result
    A8P1-X (+) JB3/PCB5/K34-X2 (-) High (reverse biased)
    A8P1-X (-) JB3/PCB5/K34-X2 (+) Low (forward biased)

    For the audio panel 2 (A9):
    NOTE: This interface contains a diode. Set the multimeter to the diode test position and take the measurements with the polarities shown.

    From To Resistance Result
    A9P1-X (+) JB3/PCB5/K34-X2 (-) High (reverse biased)
    A9P1-X (-) JB3/PCB5/K34-X2 (+) Low (forward biased)

    For the audio panel 3 (A215):
    NOTE: This interface contains a diode. Set the multimeter to the diode test position and take the measurements with the polarities shown.
    On A/C Post SB 700-23-002:

    From To Resistance Result
    A215P1-X (+) JB3/PCB5/K34-X2 (-) High (reverse biased)
    A215P1-X (-) JB3/PCB5/K34-X2 (+) Low (forward biased)

    1. If there is an open circuit, repair or replace the defective wiring as required and do close out
    2. If there is no open circuit, continue with next step.

  2. Check if there is a short circuit between the pins of LSS PROCESSOR connector (A224BP1), AUDIO PANEL 1 connector (A8P1), AUDIO PANEL 2 connector (A9P1), AUDIO PANEL 3 connector (A215P1) and Aircraft Ground as follows:
    For the LSS processor (A224):

    From To Result
    A224BP1-24 Ground
    A224BP1-25 Ground

    For the audio panel 1 (A8):

    From To Result
    A8P1-X Ground

    For the audio panel 2 (A9):

    From To Result
    A9P1-X Ground

    For the audio panel 3 (A215) (On A/C Post SB 700-23-002):

    From To Result
    A215P1-X Ground

    1. If there is a short circuit, repair or replace the defective wiring as required and install the audio panel(s).
    2. If there is no short circuit, continue with next step

  3. Replace LSS relay, circuit card 5 from junction box JB3, LSS processor.
  4. Do close out.

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