P I L O T T R A I N I N G G U I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
2-38
For Training Purposes Only
Sept 04
TAKEOFF (TO) MODE
TO mode provides pitch and lateral commands during the takeoff phase of flight.
TO mode is activated by pushing one of the throttle-mounted TOGA buttons, while on
the ground. When TO mode is selected, all other lateral and vertical modes are cleared.
Lateral TO mode generates a wings level command. The wings level command will
remain active following automatic altitude capture. TO mode captures the current
heading at 80 kts during takeoff roll.
TO mode will capture the preselected altitude.
Vertical TO mode generates a fixed pitch attitude of 17.5°, based on power being
developed by the engines. In the event of a loss of an engine, (N1 < 70% on either
engine), the pitch command will be reduced to 13°.
The autothrottles will provide full takeoff thrust until TO mode is cleared.
TO mode can be cleared by selecting the AP on (PIT), or by selecting another vertical
mode.
GO AROUND (GA) MODE
GA mode provides pitch and lateral commands for a transition from an approach to
climb out condition, when a missed approach has occurred.
GA mode is activated by pushing one of the throttle-mounted TOGA buttons, while
airborne. When GA mode is selected, autopilot is disengaged and all other lateral and
vertical modes are cleared. The resultant AP disengage warning may be canceled by
pressing the AP DISC switch.
Lateral GA mode generates a wings level command and the heading flown at GA
selection will be captured. GA will capture the preselected altitude as long it is set to a
minimum of 500 feet above TOGA initiation altitude.
GX_02_040
20
20
10
10
10
10
20
ROL
TO
200
30
00
1500
180
170
160
150
140
145
6
4
TOGA
Button
10
00
80
20
ROL
TO
20
20
10
10
10
10
20
ROL
GA
200
30
00
1500
180
170
160
150
140
145
6
4
10
00
80
20
10
10
AP1
GX_02_041
ROL
GA
AP1
TOGA
Button