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Oct 05/06
In AFCS vertical speed mode (VS), using the FCP/pitch wheel, two indications are displayed: a reference bug on the VS scale, and a digital readout in the flight mode annunciation (FMA) field.
During FMS VNAV operations, the VS advisory pointer is a magenta open circle that indicates the average VS required to climb or descend from the present position to the next climb (or descend) altitude constraint. The FMS must be the active NAV source for the pointer to be displayed.
The vertical speed scale is also used to display TCAS resolution advisories (see Chapter 17, Navigation Systems).
Vertical speed source data comes from the ADCs. Vertical acceleration from the onside IRS is used to filter vertical speed in order to provide a smoother presentation to the pilot. The filtered vertical speed is referred to as inertial vertical speed.
Vertical Speed Display
Figure 11.10.27
Air Data Flags
When ADC airspeed, altitude or vertical speed data is invalid, red air data flags are presented to replace the affected system’s information. An invalid inertial vertical speed may also cause a VS red flag to appear.
Negative Altitude Warning
A white vertically positioned NEG is displayed in the current altitude window to indicate negative barometric altitudes.
FLIGHT INSTRUMENTS Description Vol. 2 11.10.30
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Air Data Flags/RA Flag/Negative Altitude Indication
Figure 11.10.28
Air Data Reversionary Function
ADC Switch (Reversionary Panel)
When NORM is selected, the pilot and copilot electronic flight displays receive data from their individual, onside air data computers (ADCs).
When 1 is selected, the pilot and copilot electronic flight displays receive data from ADC 1 only. A yellow ADC 1 message is displayed on both L and R PFDs.
When 2 is selected, the pilot and copilot electronic flight displays receive data from ADC 2 only. A yellow ADC 2 message is displayed on both L and R PFDs.
ADC Reversionary Annunciation
Figure 11.10.29
FLIGHT INSTRUMENTS Description Vol. 2 11.10.31
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Description
The attitude information provides pilot orientation to the aircraft’s axes of inclination with respect to the horizon. The PFD’s pitch, roll and yaw indications are generated by the IRS computers. Attitude information displayed on the PFD includes:
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Aircraft and wing symbols;
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Horizon line;
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Sky/ground display;
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Pitch tape and chevrons;
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Roll scale and pointer;
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Slip/skid indicator; and
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Unusual attitude display (PFD declutter).
Attitude Information Field
Aircraft and Wing Symbols
The aircraft symbol is an inverted black V-shape. It is a stationary representation of the aircraft, and is represented by a black symbol with a white outline. Two small white rectangular wing symbols are shown to the left and right of the aircraft symbol. The V-shaped aircraft symbol appears when the flight director V-Bar (single cue) is selected.
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