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V2
The reference marker is a cyan line followed by a 2. The V2 marker is the takeoff safety speed reference. The marker is automatically removed after the V2 speed is exceeded (V2 + 40 knots
+ weight off wheels for 7 seconds).
VT
The reference marker is a cyan line followed by a T. The VT marker is the target speed reference.
VREF
The reference marker is a cyan line followed by a REF. The VREF marker is the reference approach speed (not presented in graphic).
VAC
The reference marker is a cyan line followed by an AC. The VAC marker is the approach climb speed reference during a go-around (not presented in graphic).
FLIGHT INSTRUMENTS Description Vol. 2 11.10.19
Oct 05/06
PFD REFs Speed Indications
Figure 11.10.18
FLIGHT INSTRUMENTS Description Vol. 2 11.10.20
Oct 05/06
High-Speed/Flap Overspeed Cue
An overspeed cue is provided to indicate the maximum operating speed. It appears in the upper portion of the airspeed scale, and is displayed as a solid red line.
An overspeed pre-alert occurs when the solid red line changes to an expanded alternating red and black checkerboard band, and airspeed/Mach digital readout changes from green to yellow.
When the aircraft is operated near the top of its speed envelope, the cue indicates the airspeed at which VMO/MMO will be exceeded. The overspeed clacker sounds if VMO/MMO is exceeded by 3 knots, and airspeed/Mach digital readout changes from yellow to red.
When the flaps are extended, the checkerboard cue is overlaid on the airspeed indicator. The bottom of the cue represents the VFE speed for the existing flaps selection. The overspeed clacker sounds if VFE is exceeded.
Low-Speed Cue
The low-speed cue is generated by angle-of-attack information from the auxiliary angle-of-attack vane. It appears three seconds after lift-off, from the lower portion of the airspeed scale, and is displayed as a solid red line.
A low-speed pre-alert occurs when the solid red line cue changes to an expanded alternating red and black checkerboard band, and airspeed/Mach digital readout changes from green to yellow (the aircraft is within a few knots of activating the stick shaker). In the landing configuration (gear down, flaps 45), the top of the cue represents a calculated airspeed of 1.06 VS, the speed at which
the stick shaker will activate.
If current airspeed becomes less than the top of the low speed cue, the airspeed/Mach digital readout changes color to red.
When AOA data fails or is missing (which may or may not be due to a stall system failure), the low-speed cue changes to its default setting. The speed cue stops at 100 knots, and a yellow line extends upwards from the top of the checkerboard to 120 knots. The intent of this defaulted failure indication is to provide some remaining indication of low speed awareness, while indicating that the low-speed cue is in a degraded and defaulted mode.
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