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(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.

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04/26/21

Message Overview:

Message Name:

VOR 1/2 FLAG (Warning)

Identifier: 345OBS006
Effectivity: AIRCRAFT 20501 - 20999
System: Navigation
Associated CAS: None
System Description: 34-51-00
Schematic Diagram: 34-51-00
Wiring Diagram: 34-51-01
34-51-05

Message Description:

The red 'VOR' warning flag indicates the respective navigation input is invalid.

Possible Causes:

  • L VHF Navigation Receiver (ADF VIR 1) (A47)
  • R VHF Navigation Receiver (ADF VIR 2) (A48)
  • ADF VIR Antenna
  • Weak Signal
  • Coax
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the VHF Navigation Receiver AMM 34-51-01-000-801
Installation of the VHF Navigation Receiver AMM 34-51-01-400-801
Removal of the VOR/LOC Antenna AMM 34-51-13-000-801
Installation of the VOR/LOC Antenna AMM 34-51-13-400-801
Removal of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. The two VHF NAV receivers have continuous self-test functions, and automatically report fault conditions to the maintenance diagnostic computer (MDC).
  2. The diagnostic words go through the RIUs and the input/output concentrators (IOCs) of the integrated-avionics processing system (IAPS), to the MDC.
  3. Also, when the receiver has a fault condition, its monitor function sends data to the PFDs and MFDs to remove the applicable displays and/or to show the applicable warning flags.

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