737 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System
Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 10.22.7
Failure Flags and Data Source Annunciations
Failure flags are displayed for invalid sensor status and miscompares between
similar parameters. These flags are generally indicated by boxed annunciations for
the affected parameters, and in the case of failure, the removal of all symbols
related to the fault. In some cases, symbols are removed as a result of other
symbols being removed due to a fault.
Flags associated with a miscompare of similar data result in the display of a flag
without the removal of the related symbols. The flag indicates the applicable data
should be verified by cross-checks with other flight deck displays.
Data source annunciations are provided in a few cases to annunciate the source of
displayed data when other than normal.
Dashes replace numbers if there is no computed data.
September 26, 2013
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