Honeywell SPZ-8000 - Barometric Altitude Scale; Altitude Analog Scale; Altitude Digital Readout; Altitude Trend Vector

2. C. (3) Barometric Altitude Scale
(a)
(b)
(c)
(d)
(e)
(f)
Altitude Analog Scale - The barometric altitude scale is a
moving tape display with fixed current value pointer. The
white scale markings on the tape
are in 100-foot intervals.
The scale is labeled every 200 feet below 10,000 feet (Figure
205) and every 500 feet above 10,000 feet (Figure 203).
The
tape markings, current value data, and current value pointer
are white with gray background shading for display enhancement.
Altitude Digital Readout - A digital readout of the current
altitude is magnified and displayed within the current value
pointer. The current data is displayed in white using a
digital rolling drum presentation readable to a 20-foot
resolution.
For climb/descent rates greater than 1000 feet per
minute, the rolling drum digits are replaced by two dashes to
enhance altitude scale readability (Figure 203). Below 10,000
feet, an indication for absence of the most significant digit
is given (Figure 205).
Altitude Trend Vector - The magenta altitude trend vector
originates at the tip of the current value pointer and travels
along the inboard side of the altitude scale (Figure 203). The
trend vector is an altitude predictor term with a length
equivalent to 6 seconds.
Altitude Select (ALT SEL) Digital Readout - ALT SEL digital
data is displayed in green at the top of the altitude scale.
The ALTSEL target data is set by the pilot using the flight
guidance controller.
Altitude Select Bug - The green triangular ALT SEL bug travels
along the inboard side of the altitude scale.
The bug position
on the scale corresponds to the ALT SEL digital target value
previously discussed.
The bug is present on the scale at all
times with the exception of glideslope (GS) capture mode
active. Glideslope capture has no effect on the digital ALT
SEL display.
Altitude Alert Indications
- Approaching the ALT SEL reference,
the ALT SEL bug and readout turn from green to amber whenever
actual altitude is within 1000 feet of the ALT SEL reference
indicators. These displays remain amber until the actual value
is within 250 feet at which point they turn back to green.
Departing a selected altitude, the ALT SEL bug and readout turn
from green to amber whenever the current altitude value is
greater than 250 feet from the ALT SEL reference indicators.
If the excursion from altitude exceeds 1000 feet, the bug and
readout return to their normal green color.
22-14-00
Page 219
Aug 15/91
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