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When the airspeed is below 30 knots, 30 knots shows.
Airspeed Disagree Message
If the captain and first officer airspeed disagrees by 5 knots or
more, the IAS DISAGREE message shows at the bottom of the
speed tape. The message is amber.
Mach Number
Mach number shows as a digital readout. It shows below the
airspeed tape when the Mach number is more than 0.4. The
display does not show when the Mach number is below 0.38 or
if the Mach number display fails.
Speed Trend Vector
The speed trend vector shows the predicted airspeed in 10
seconds based on current acceleration or deceleration. This
vector shows when the speed trend is more than 4.5 knots.
Selected Speed/Selected Mach Number
There is a selected speed bug and a digital readout. The value
of the selected speed or Mach number is the value the pilot
selects on the mode control panel (MCP) or the value the FMC
calculates. The bug points to the selected speed on the speed
tape. The digital readout above the speed tape shows the
selected speed or the selected Mach number.
When the selected speed or Mach number is off the scale, only
half of the bug shows at the top or the bottom of the speed tape.
See the digital flight controls section for more information on
selected speed. (SECTION 22-11)
Takeoff Reference Speeds
The speed tape shows these reference speeds for takeoff:
* Reminder for airspeed callout at 80 knots (optional)
* Reminder for airspeed callout at 100 knots (optional)
* Decision speed (V1)
* Rotation speed (VR)
* Selected target speed (V2)
* Selected target speed plus 15 knots (V2 + 15).
The DEUs set the reminder for airspeed callout. This indication
is blank after takeoff when the pilot first retracts the flaps or
when the pilot enters Vref on the CDU (optional).
CDS - PFD - AIRSPEED INDICATIONS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-62-00-301
For takeoff, the pilot sets V2 on the mode control panel. The DEU
calculates V2 + 15 and shows it on the speed tape.
The pilot can manually set a white bug with the engine display
control panel speed reference selector. The pilot can set this
white bug at any value more than 60 knots. It shows on the
speed tape and the numeric value shows on the bottom right of
the speed tape when the speed reference selector is in the
triangle position.
The NO VSPD flag shows when V1 or VR is not valid or is not
entered in the flight management computer system. If a route of
flight is not entered, you will see this flag.
See the flight management computer system section for more
information on takeoff reference speeds and the speed
reference bug. (SECTION 34-61)
Landing Reference Speeds
The landing reference speed bugs are Vref and Vref + 15.
The FMC calculates Vref. The pilot can set Vref manually with
the speed reference selector on the engine display control
panel.
The DEU calculates Vref + 15.
See the flight management computer system section for more
information on landing reference speeds. (SECTION 34-61)
Manually Entered Weight
The pilot can enter the airplane weight with the speed reference
selector on the engine display control panel. The weight shows
in pounds or kilograms adjacent to the speed tape.
See the flight management computer system section for more
information on airplane weight. (SECTION 34-61)
Limit Speeds
Maximum speed shows as red and black alternate squares. If
the maximum speed value is on the speed tape, the maximum
speed display starts at the top of the speed tape and goes down
to the maximum operating speed.
The maximum maneuver speed shows as a hollow amber bar.
It shows the highest speed before the start of the high speed
buffet.
Minimum speed shows as red and black alternate squares. If
the minimum speed value is on the speed tape, the minimum
speed display starts at the bottom of the speed tape and goes
up to the minimum operating speed.
CDS - PFD - AIRSPEED INDICATIONS
EFFECTIVITY
SHZ ALL 31-62-00
Page 98.13
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-62-00-301
The minimum maneuver speed shows as a hollow amber bar. It
shows the lowest speed before the start of the stick shaker.
If the airspeed is less than 70 percent of the minimum maneuver
speed, the digital airspeed readout shows amber. The readout
　
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