737 Flight Crew Operations Manual
Flight Instruments, Displays -
PFD/ND – Displays
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D6-27370-866-EGP 10.11.57
Center APP and Center VOR Modes
1 Heading Failure Flag (center APP, center VOR modes)
Heading indication failed. Heading cannot be displayed.
2 VOR Failure Flag (center VOR mode)
VOR has failed.
3 ADF 1 and ADF 2 or VOR 1 and VOR 2 Failure Flag (center APP,
center VOR modes)
VOR or ADF has failed.
4 DME 1 and DME 2 Failure Flag (center APP, center VOR modes)
Selected VOR DME has failed.
5 Reference VOR DME (center VOR mode) and Reference ILS DME
(center APP mode)
Reference VOR or ILS DME has failed.
6 ILS Localizer Failure Flag (center APP mode)
ILS localizer course indication has failed.
VOR2
ADF2
VOR1
VOR2
DME1
VOR1
ADF1
LOC
S
/
G
DME2
DME1
HDG
FAIL
TCAS
DME2
September 15, 2016