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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:

VERTICAL NAVIGATION FLAG (Caution)

Identifier: 346OBS003
Effectivity: AIRCRAFT 20501 - 20999
System: Navigation
Associated CAS: None
System Description: 34-61-00
Schematic Diagram: 34-61-00
Wiring Diagram: 34-61-03
34-61-07

Message Description:

The amber 'VNAV' caution flag identifies that the on-side Vertical Navigation data is inaccurate.

  • Vertical navigation computations are made based on the loaded flight plan in the FMS. A valid flight plan and valid assent / descent profile need to be programmed. If the conditions are met, data bus information for display is internal to the IAPS from the Flight Management 850 cards.
  • MDC troubleshooting information may help isolate data validity, prior to component replacement and data bus ring-out.

01_vnv_c45_current_faults

Possible Causes:

  • Flight Management Computer 1 (FMC 1) (A4-FMC1)
  • Flight Management Computer 2 (FMC 2) (A4-FMC2)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Flight Management Computer (FMC) AMM 34-61-01-000-801
Installation of the Flight Management Computer (FMC) AMM 34-61-01-400-801
Removal of the Control Display Unit (CDU) AMM 34-61-05-000-801
Installation of the Control Display Unit (CDU) AMM 34-61-05-400-801
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. None

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