Vertical Deviation
Aircraft vertical deviation is displayed to the
right of the ADI sphere. The vertical deviation
scale indicates glideslope (GS) or VNAV de-
viation. This scale is also used to display mi-
crowave glidepath (GP) deviation if MLS is
installed. The pointer indicates a "fly to" con-
dition. When the selected navigation source is
VOR, LOC or LOC BC, the vertical deviation
scale, label and pointer are removed from
view. When the navigation source is ILS, and
ILS frequency is tuned on the corresponding
NAV receiver, the GS vertical deviation scale
and pointer are displayed, with a "GS" above
the scale. For excessive deviations, the GS
pointer changes color from white to amber, and
the scale turns amber and flashes.
Radio Altitude
Radio altitude (RA) is displayed on the ADI
sphere and on the altitude tape (Figure 16-
31). On the ADI, RA is a digital readout at the
bottom of the sphere. On the altitude tape,
proximity to the ground is illustrated as brown
shading once the RA is within 550 feet. The
digital readout range is up to 2500 feet. Once
the upper limit has been exceeded the digital
display will blank. For low altitude aware-
ness, a radio altitude (RA) reference (decision
height) can be set with the PFD bezel mounted
RA/BARO switch and minimums knob (Figure
1 6 - 2 6 ) . O n c e R A m i n i m u m s h ave b e e n
reached, the characters "MIN" will flash in-
side the RA/BARO annunciator box in the
lower right quadrant of the ADI. An aural
voice alert will also sound “Minimums,
Minimums.”
BARO Minimums
BARO minimums are displayed as a digital
readout, as a bug on the altitude tape, and as
a MIN annunciation in the RA/BARO annun-
ciator box in the lower right quadrant of the
ADI (Figure 16-26). The displayed range is
from 10 feet to 16,000 feet. The BARO bug is
displayed as a magenta rectangular "D" shape
box, positioned to the left of the altitude tape,
with a line extending from the middle edge of
the "D" to the right edge of the altitude tape.
BARO minimums are set with the RA/BARO
switch and minimums set knob of the PFD
bezel controller. For low altitude awareness,
the same alerts for RA, as previously de-
scribed, apply to BARO minimums.
Marker Beacons
Marker beacons are displayed as illustrated in
Figure 16-32. An active marker will only be
displayed if the navigation source is LOC/ILS
and an ILS frequency is tuned on the corre-
sponding NAV receiver.
Altitude
The barometric altitude display is presented
as a vertical tape. The tape provides single
chevrons in 500 foot increments, double
chevrons in 1000 foot increments, tick marks
in 100 foot increments, and a rolling digital
readout for accurate interpretation of baro-
metric altitude. The altitude tape also includes
the following:
• Altitude trend vector – A thin vertical
bar to the left of the altitude tape repre-
sents the altitude the aircraft will attain
in 6 seconds if the present vertical speed
is maintained.
• Altitude preselect – The digital readout
appears above the altitude tape. The al-
titude preselect bug, is a notched ma-
genta rectangle which is set on the left
side of the altitude scale. The bug and dig-
ital altitude preselect are set simultane-
ously on both PFDs using the altitude
select knob (ASEL) on the guidance con-
troller panel. When outside 550 feet of the
currently displayed altitude, a portion of
the bug will be blanked from view. This
is referred to as the “parked” position.
• Altitude alert – This function is driven
by the flight director, and is displayed on
the PFD as a color change to the digital
selected altitude and the ASEL annunci-
ator. As the aircraft approaches within
1000 feet of the selected altitude, the
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
16-52
FOR TRAINING PURPOSES ONLY
FlightSafety
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