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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:

ALTITUDE FLAG (Warning)

Identifier: 341OBS002
Effectivity: AIRCRAFT 20501 - 20999
System: Navigation
Associated CAS: None
System Description: 34-17-00
Schematic Diagram: None
Wiring Diagram: 34-13-05
34-13-09

Message Description:

The red 'ALT' warning flag indicates invalid altitude source.

  • A loss of all data from the selected ADC, most likely caused by an Air Data Computer fault or power failure.
  • Verification of system failure can be checked on the MDC current fault page for further system details.

01_alt

Possible Causes:

  • None

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

None

Troubleshooting Recommendations:

Assure that the Air Data computer breakers are in, LH system CB1-C1, RH system CB2-C1. Pull and reset breakers, then recheck system for failures.

  • Switch the Air Data reversionary switch to the off side source "1" or "2"position. The amber AIR DATA PFD flag should identify a single ADC source has been selected. The red ALT warning flag indication should clear.
  • If the red ALT warning flag indication does not clear, and other air data sources are displayed, swap or replace the PFD.
  • If the red ALT warning flag indication clears, troubleshoot the on-side Air Data Computer system.

01_alt60_lh_cbpnl60_rh_cbpnl60_reversionary_switch

60_pfd_fail_indication

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