737 Flight Crew Operations Manual
Flight Instruments, Displays -
PFD/ND – Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 10.16.15
ISFD Failure Flags
The OUT OF ORDER annunciation replaces the display when a total ISFD system
failure occurs.
1 Airspeed flag
Airspeed information has failed.
2 ILS localizer failure flag
ILS localizer has failed.
3 ILS glideslope failure flag
ILS glideslope has failed.
4 Altitude flag
Altitude information has failed.
5 Attitude flag
Attitude information has failed.
6 Heading flag
Heading data has failed.
ATT
LOC
HDG
A
L
T
S
P
D
G
/
S
OUT OF ORDER
September 15, 2016
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