737 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System,
Symbology
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
10.42.18 D6-27370-866-EGP
Failure Flags and Data Source Annunciations
SYMBOL NAME MODE REMARKS
IRS attitude flag All IRS pitch or roll attitude has
failed.
Pitch
miscompare flag
All Indicates a pitch miscompare
of greater than 5 ° for more
than 1.5 seconds.
Roll miscompare
flag
All Indicates a roll miscompare of
greater than 5 ° for more than
1.5 seconds.
Heading flag All Heading data has failed.
No heading All IRU heading has no computed
data.
Airspeed flag All Airspeed information has
failed. In PRI mode, if
airspeed has no computed
data, airspeed data is removed
and no failure flag is
displayed.
The boxed characters are
positioned vertically in the
PRI mode or horizontally in
the AIII, IMC or VMC modes.
March 27, 2014
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