.  
when the V2+15 bug is displayed for takeoff, the flap maneuvering speed
bug for the current flap setting is not displayed, except for flaps 1 takeoff.

.  
numbered flap maneuvering speed bugs are removed when flap lever is
moved to flaps 30 or 40

.
flap bugs inhibited if less than VREF +4

.
UP bug not displayed above approximately 20,000 feet altitude.

V2+15 (white)
Displayed for takeoff.
Removed when either of the following occurs:
.
at first flap retraction

.
when VREF is entered in the CDU.

Takeoff Reference Speeds (green)
Indicates V1 (decision speed) and VR (rotation speed) as selected on the CDU TAKEOFF REF page (refer to Chapter 11, Flight Management, Navigation) or as set with the speed reference selector on the engine display control panel:
.  
amber NO VSPD is displayed on the ground if V1 or VR is not selected
on the CDU or is not set with the speed reference selector

.
displayed for takeoff when speed is greater than 80 knots

.
removed at lift–off

.
V1 speed is displayed at the top of airspeed indication when selected and

value is off scale.
YA613, YA626, YA801 - YK104

.
V1 is automatically called out by voice aural.

YA613, YA626, YA801 - YK104 Note: The Look Ahead Terrain Alerting system must be incorporated for the automatic V1 aural callout to be functional.

Minimum Maneuver Speed (amber)
Top of bar indicates minimum maneuver speed.
Copyright . The Boeing Company. See title page for details.
10.11.14   March 28, 2005

Flight Instruments, Displays -PFD/ND – Displays 737 Flight Crew Operations Manual
Inhibited on takeoff until first flap retraction or valid VREF entered.

Minimum Speed (red and black)
Top of bar indicates the speed at which stick shaker occurs.

Maximum Maneuvering Speed (amber)
YA613 - YC413 When flaps are not up, bottom of the bar indicates flap limit placard speed for the next normal flap setting. The display logic is based on a normal flap setting sequence of 1, 5, 15, 30. The bar is removed when the flap lever is moved to the landing flap selected on the APPROACH REF page or when the flap lever is moved to flaps 30 or 40.
YD651 - YK104 When flaps are not up, bottom of the bar indicates flap limit placard speed for the next normal flap setting. The display logic is based on a normal flap setting sequence of 1, 5, 15, 30. The bar is removed when the flaps reach the landing flap selected on the APPROACH REF page or when the flaps reach flaps 40.

VREF+15 (white)
YA613 - YC413, YK101 - YK104

Displayed after selection of VREF.
VREF+20 (white)
Displayed after selection of VREF.

Landing Reference Speed (green)
Indicates REF (reference speed) as selected on the CDU APPROACH REF page (refer to Chapter 11, Flight Management, Navigation) or as set with the speed reference selector on the engine display control panel.
REF speed is displayed at the bottom of airspeed indication when selected and value is off scale.

Copyright . The Boeing Company. See title page for details.
Flight Instruments, Displays -PFD/ND – Displays 737 Flight Crew Operations Manual

Speed Reference Display (green)
Displayed if the airspeed and/or weight is entered via the speed reference selector on the engine display control panel: . on the ground, V1, VR, and takeoff gross weight may be selected; if VREF is selected, INVALID ENTRY is displayed
.  
in flight, VREF and landing gross weight may be selected; if V1 or VR is
selected, INVALID ENTRY is displayed

.
removed when the speed reference selector is moved to the SET position.

80 Knot Airspeed Bug (white)
Indicates 80 knots:
.
displayed automatically during preflight

.
removed at first flap retraction or when VREF is entered.

Flap/VREF Speed Annunciation (green)
Indicates selected landing flap position and VREF as selected on the CDU APPROACH REF page:
.
displayed for flaps 15, 30 and 40

.
not shown for VREF set with the speed reference selector..

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

Flight Instruments, Displays -PFD/ND – Displays 737 Flight Crew Operations Manual
PFD – Attitude Indications Attitude Indications – General
The attitude indication displays ADIRS attitude information. YA613 - YA809, YC411, YC413, YK101 - YK104
　
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