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vertical speed measured in feet per minute. Initially the rate will be vertical speed sensed at the time of VS mode engagement.
Turning the UP/DOWN wheel on the FGP changes the VS reference value. Each click of the wheel is equal to ± 100 ft/min.
APPROACH MODE (APPR)
In the approach mode, the FGC generates commands to track vertical guidance for ILS precision glideslope approaches or
for FMS non-precision glide path (GP) approaches. Approach mode is selected by pushing the APPR button on the FGP.
GLIDESLOPE MODE
Glideslope is automatically selected when in approach mode, inbound, with a valid localizer as the lateral navigation
source. Glideslope mode is cleared by deselection of approach mode. When armed, glideslope mode is also cleared by turning
outbound, or by loss of a valid localizer as the lateral navigation source. When captured, glideslope mode is cleared by
changing the source of the lateral navigation source to anything other than a valid localizer.
Glideslope mode generates commands to capture and track glideslope. Captures can be performed from below or above the
beam. The capture point is a function of the closure rate, with the capture point moving away from the beam for high closure
rates. Capture will not occur if the localizer is not captured, or if the FGC is not receiving valid glideslope data.
Upon glideslope capture, other vertical modes are automatically cleared.
When the APPR capture occurs, the flight directors automatically change to independent mode. When the glideslope captures
are not concurrent and only one side has captured, vertical mode selection, PFD annunciation, etc. operate independently
on the noncaptured side.
The GS mode is deselected when one of the following occur:
- Another mode is selected.
- Changing the active NAV source.
- VOR/LOC frequency is changed.
- By pressing APPR button again.
- Changing the XFR side when APPR is armed.
- The FDs are turned off while the AP disengages.
Glideslope arm is annunciated by the white GS message in the vertical (arm) field on the PFD.
CFO0401002_009
00
IAS 225
M
.54
.50
.42
.38
4200
4
2
1
1
4
AP YD VS
20
10
20
10
350 16000
350 00
4
3
100
00
00
352 00
80
20
2
29.92 IN
.46
.46
.5
1
UTC
° C
11 : 42
SAT -15
ISA -5 ° C
ROLL 2000
AUTOMATIC FLIGHT CONTROL SYSTEM
Volume 2 Flight Crew Operating Manual May 06/2005
04-01-20 CSP 100-6 REV 2
FLIGHT DIRECTOR VERTICAL MODES (Cont)
GLIDEPATH MODE
This mode can be selected only by the FMS, as follows:
- While FCS is in the VNAV mode and approach mode
- FMS is the active Nav source
- No preselect Nav source is active
- FMS VNAV is valid
There is no button for glide path mode on the FGP. Glide path is automatically deselected/cleared by deselection of VNAV
or approach modes or by selection or capture of another active vertical mode.
Glide path mode generates commands to track a vertical path, defined by the FMS.
Glide path capture disables use of the preselected altitude mode operation. Glide path arm is annunciated with a white GP
in the vertical arm field of the PFD. Glide path capture is annunciated by the green GP in the vertical capture field on the
PFD.
CFO0401002_021
00
IAS 225
M
.54
.50
.42
.38
4200
4
2
1
1
4
APPR LOC1 AP YD GS
20
10
20
10
350 16000
350 00
4
3
100
00
00
352 00
80
20
2
29.92 IN
.46
.46
.5
1
UTC
° C
11 : 42
SAT -15
ISA -5 ° C
CFO0401002_010
00
IAS 225
M
.54
.50
.42
.38
4200
4
2
1
1
4
APPR LOC2 ALTV FLC GP
AP YD PTCH
20
10
20
10
350 16000
350 00
4
3
100
00
00
352 00
80
20
2
29.92 IN
.46
.46
.5
1
UTC
° C
11 : 42
SAT -15
ISA -5 ° C
HDG
AUTOMATIC FLIGHT CONTROL SYSTEM
May 06/2005 Flight Crew Operating Manual Volume 2
REV 2 CSP 100-6 04-01-21
AUTOPILOT
DESCRIPTION
The Challenger 300 his equipped with a three axis digital fail-passive autopilot. Autopilot servos provide command inputs
to the ailerons and elevators. The rudder is controlled by the yaw damper system. The coupled flight guidance computer
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