.
if STD is displayed, selects the preselected barometric setting

Heading Indication
Displays airplane heading.
ISFD Messages

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Flight Instruments, Displays -EFIS Instruments (PFD) – Controls 737 Flight Crew Operations Manual

Attitude Messages
Indicates attitude display status.
.
ATT:RST (amber) – attitude must be reset using the attitude reset switch

.
ATT 10s (amber) – 10 second attitude realignment in progress

.
WAIT ATT (amber) – indicates temporary self correcting loss of attitude

Initialization Message
INIT 90s (amber) – 90 second initialization countdown.
.
countdown stops if excessive motion is detected

.
countdown resumes when motion stops

.
ATT:RST displays if initialization is not complete within six minutes

Copyright . The Boeing Company. See title page for details.
10.16.18  March 28, 2005

Flight Instruments, Displays -EFIS Instruments (PFD) – Controls
737 Flight Crew Operations Manual
ISFD Failure Flags
The OUT OF ORDER annunciation replaces the display when a total ISFD system failure occurs.

Airspeed flag
Airspeed information has failed.

ILS localizer failure flag
ILS localizer has failed.

ILS glideslope failure flag
ILS glideslope has failed.

Altitude flag
Altitude information has failed.

Attitude flag
Attitude information has failed.

Heading flag
Heading data has failed.
Copyright . The Boeing Company. See title page for details.
Flight Instruments, Displays -EFIS Instruments (PFD) – Controls
737 Flight Crew Operations Manual
Standby Radio Magnetic Indicator
YA721 - YA809, YC411 - YD655
1
2
3 4  R O V  ADF  ADF  R O V  5 6 
CENTER INSTRUMENT PANEL 
YA613 - YA687, YC153, YC154, YK101 - YK104 
1 

2
3  R O V  R O V  5 
4  ADF  ADF INOP  6 
CENTER INSTRUMENT PANEL 

Heading Warning Flag
The compass signal from the air data inertial reference system is lost.
Copyright . The Boeing Company. See title page for details.
10.16.20  June 1, 2005

Flight Instruments, Displays -EFIS Instruments (PFD) – Controls
737 Flight Crew Operations Manual

Bearing Pointers
.
narrow pointer uses signals from the VHF NAV receiver No. 1 or ADF

receiver No. 1
YA721 - YA809, YC411 - YD655

.
wide pointer uses signals from the VHF NAV receiver No. 2 or ADF

receiver No. 2.
YA613 - YA687, YC153, YC154, YK101 - YK104

.
wide pointer uses signals from the VHF NAV receiver No. 2.

Bearing Pointer No. 1 Warning Flag
VOR mode:
.
RMI power failure

.
VHF NAV signal unreliable. ADF mode:

.
RMI power failure

.
ADF failure or signal unreliable.

VOR/ADF Bearing Pointer No. 1 Switch
ROTATE – selects VOR or ADF for the bearing pointer.

Bearing Pointer No. 2 Warning Flag
VOR mode:
.
RMI power failure

.
VHF NAV signal unreliable.

YA721 - YA809, YC411 - YD655 ADF mode:
.
RMI power failure

.
ADF failure or signal unreliable.

VOR Bearing Pointer No. 2 Switch YA613 - YA687, YC153, YC154, YK101 - YK104
ROTATE – selects VOR for the bearing pointer.

VOR/ADF Bearing Pointer No. 2 Switch YA721 - YA809, YC411 - YD655
ROTATE – selects VOR or ADF for the bearing pointer.
Copyright . The Boeing Company. See title page for details.
Flight Instruments, Displays -EFIS Instruments (PFD) – Controls 737 Flight Crew Operations Manual

Clock
YA613 - YA687, YA801 - YC413, YK101 - YK104

YA721, YA722

Copyright . The Boeing Company. See title page for details.
10.16.22  June 1, 2005

Flight Instruments, Displays -EFIS Instruments (PFD) – Controls
737 Flight Crew Operations Manual
YD651 - YD655

Chronograph (CHR) Control
PUSH –
. controls the start, stop and reset functions of the CHR display and second
hand with successive pushing
. overrides any existing ET display.

Time/Date Indicator YA613 - YA687, YA801 - YK104
.  
displays UTC or manual time (hours, minutes) when time is selected with the time/date pushbutton

.  
alternately displays day–month and year when date is selected with the
　
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