background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults by MDCBy Tips

Select color for CAS message that you wish to troubleshoot

(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.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

02/26/21

Message Overview:

Message Name:

NO VIR-1 BUS INPUT

Message Code:

B3-007007

Associated CAS:

None

Reporting LRU: ISI
System Description: 34-12-00
Schematic Diagram: 34-12-00
Wiring Diagram: 34-12-01

Message Description:

ILS or VIR-1 BUS input to ISI is reported failed.

Possible Causes:

  • VHF Communication Unit No. 1 (LH) (A7)
  • Instrument Landing System (ILS)
  • Integrated Standby Instrument (ISI) (A90)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Integrated Standby Instrument AMM 34-12-01-000-801
Installation of the Integrated Standby Instrument AMM 34-12-01-400-801
Removal of the VHF Navigation Receiver AMM 34-51-01-000-801
Installation of the VHF Navigation Receiver AMM 34-51-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset circuit breaker CB1-A1 NAV 1.

    1. If system checks are good, do close out.
    2. If problem remain continue to next step.

  2. Cycle STBY INST push button switch.

    1. If system checks are good, do close out.
    2. If problem remain continue to next step.

  3. Swap Test VHF Navigation Receivers 1 & 2.

    1. If fault is cleared, replace defective VHF Navigation Receiver.
    2. If problem remains continue to next step.

  4. Do wiring check of L-NAV-VIR-1 ARINC bus between ISI and Navigation Receiver No. 1. Repair as necessary.

    1. If system checks are good, do close out.
    2. If problem remain, continue to next step.

  5. Replace ISI.
  6. Do close out.

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.