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Vertical Takeoff Mode
Figure 4-35
NOTE
7000
5000 1.0
10
10
MDA
A
A
TO
A
DR TO
ALTS
YD
2500M 4
4
2
2
1
1
200
29.92 IN
P604_04_049
0 FT
60
40
VT 158
V2 139
VR124
V1 120
0
200
300
000
100
2
1
100
AUTOMATIC FLIGHT CONTROL SYSTEM
For Training Purposes Only
Sept 04
4-47
P I LOT T R A I N I N G GU I D E
Vertical Go-Around Mode
In the air, pushing either TOGA (Takeoff/Go-Around) button mounted on the thrust
levers selects the Go-Around mode and clears all other vertical modes. Lateral and
vertical go-around mode (GA) selections are coincident. During go-around mode, the
flight directors operate in dual independent mode. When Go-Around mode is active, a
green GA annunciation appears in the vertical active field of the FMA.
The autopilot will disengage whenever a TOGA button is
pressed on the ground or in-flight. The autopilot visual and aural
disengage warnings may be canceled by pushing either TOGA
button again, or by pushing the AP/SP DISC switch.
The vertical component of Go-Around mode (GA) generates a 10-degree pitch-up
command.
Go-Around vertical mode is cleared by
• selecting or capturing another active mode
• engaging the autopilot, or
• pressing the FD SYNC button
Vertical Go-Around Mode
Figure 4-36
NOTE
7000
5000 1.0
10
20
A
A
GA
A
DR GA
A
AP
2500M 4
4
2
2
1
1
M.456
200
160 T
2
140
170
180
2
100
200
900
800
000
29.92 IN
P604_04_050
1850 FT
AUTOMATIC FLIGHT CONTROL SYSTEM
4-48 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Glideslope Mode
Glideslope mode (GS) generates commands to capture and track the glideslope of an
ILS approach. Each flight director captures independently in approach mode, and
operates in the dual independent configuration.
Glideslope mode becomes armed automatically when the aircraft is inbound, and in
approach mode (APPR button selected), with less than 105 degrees between heading
and LOC course. When armed, a white GS annunciation appears in the vertical armed
field of the FMA.
Glideslope capture can only occur after LOC capture and is possible from above or
below the glideslope beam. Prior to GS capture, the FCCs operate in the current active
vertical mode. Upon GS capture, the previously active vertical mode clears
automatically, and a green GS annunciation is displayed in the vertical capture field of
the FMA. The capture point is a function of the closure rate, and the capture will
always occur if the deviation is less than 10% of full-scale deflection (under 0.2 dots).
Glideslope mode is cleared by:
• selection of NAV mode
• loss of Approach mode, or
• loss of Localizer (NAV SOURCE change or loss of signal)
AUTOMATIC FLIGHT CONTROL SYSTEM
For Training Purposes Only
Sept 04
4-49
P I LOT T R A I N I N G GU I D E
Vertical Navigation
Pushing the VNAV button on the FCP alternately selects and clears Vertical
Navigation mode. VNAV is active when it is selected and valid. VNAV is valid when
the following conditions are met:
• an active flight plan with a TO waypoint exists in the FMS
• the active navigation source is either a valid FMS or localizer
• preselected altitude, barometric altitude, and airspeed or Mach are all valid
When VNAV is active, the letter “V” appears in front of the active/captured vertical
mode annunciation of the FMA. Other distinct VNAV modes may also be annunciated
on the vertical armed or active/captured fields of the FMA.
Selecting Vertical Navigation mode (VNAV) allows the FMS to provide vertical
steering commands to the flight director to ensure the vertical flight profile of the
active flight plan is honored. With VNAV active, the FMS will automatically sequence
the vertical flight modes and set target airspeeds and altitudes to follow the
programmed flight profile. The flight crew may also manually select other vertical
modes (pitch, flight level change, vertical speed, altitude hold) and modify airspeed/
Mach references while VNAV is active. These actions will suspend FMS control, but
do not prevent subsequent mode activation by the FMS.
The altitude preselector overrides any VNAV commands, except
FMS glide path (GP) mode.
　
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