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190 ROLL 3 000
20 20
TO
80
70
60
50
0300
A/T1
45
6
T/O 190 ROLL 3 000
20 20
TO
100
90
80
70
0300
A/T1
HOLD
65
6
The takeoff
thrust control mode reactivates
at an altitude transition of 400 feet during the takeoff
climbout.
If a change to the active EPR rating, either by the crew or by automatic means, has
occurred, then the A/T will control the engine power setting to the new active rating.
Takeoff
Thrust Hold Control Mode
The takeoff
thrust hold control mode is activated to ensure that no thrust reductions occur during
takeoff
between the time the airplane transitions above 60 knots to 400 feet AGL.
The takeoff
thrust hold control mode deactivates
as the airplane transitions through 400 feet AGL
during takeoff
climbout.
Upon detecting an A/T mode transition, the new A/T mode indication will
flash for 5 seconds.
GF1810_050
In flight below 400 feet AGL In flight above 400 feet AGL
250 ROLL 3 000
20 20
TO
200
190
180
170
0600
A/T1
HOLD 190 ROLL 3 000
20 20
TO
200
190
180
170
0800
A/T1
T/O
165
6
1000
1000
165
6
F3
LO
F3
LO
POWER PLANT
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
18−10−38
AUTOTHROTTLE SYSTEM (CONT'D)
Takeoff
Thrust Hold Control Mode (Cont’d)
A/T T/O mode will remain enabled until 400 feet AGL. Following the 400 feet AGL transition, with
A/T engaged, T/O mode remains active until a non T/O AP/FD mode activates. Upon detecting an
A/T mode transition, the new A/T mode indication will flash for 5 seconds.
GF1810_051
In flight TO mode selected on AP/FD In flight HDG and FLC selected on AP/FD
250 ROLL 3 000
20 20
TO
200
190
180
170
1100
A/T1
T/O
165
6
1500
F3
LO
250 HDG 35000
20 20
FLC
200
190
180
170
2800
A/T1
THRUST
165
6
3000
F3
LO
AP1
Flight Level Change Thrust Control Mode
The flight level change thrust control mode activates when the crew selects the AP/FD FLC mode
or when the FMS engages the VFLC mode. The A/T selects the active upper/lower EPR rating for
climb/descent.
The active upper and lower EPR ratings are either computed from the phase of flight or are pilot
selected via an EPR rating menu.
For small flight level change climbs and descents, the A/T will provide thrust as appropriate to
attain a programmed rate of climb/descent. The programmed rate of climb/descent is proportional
to the magnitude of the selected altitude change. Full power climbs and full idle descents are
commanded when the target climb/descent rate increases beyond the capability of the airplane for
the active upper and lower EPR rating.
GF1810_052
Flight Level Change mode
235 HDG 35000
20 20
FLC
200
190
180
170
2800
A/T1
THRUST
165
6
3000
F3
LO
AP1
ASEL
When the selected altitude is captured, the thrust mode will automatically change to SPD mode.
Upon detecting an A/T mode transition, the new A/T mode indication will flash for 5 seconds.
GF1810_053
Flight Level Change mode transition to SPD Mode
290 HDG 35000
20 20
ASEL
300
280
350 00
A/T1
SPD
255
6
3000
AP1
POWER PLANT
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
18−10−39
AUTOTHROTTLE SYSTEM (CONT'D)
Airspeed Control Mode
The airspeed control mode is the basic control mode of the A/T. Engagement of the A/T system
inflight while not in T/O or Retard mode, with no AP/FD mode engaged, will result in the A/T
engaging in airspeed control mode. Airspeed control mode is also active if the A/T is engaged
inflight with the AP/FD engaged in altitude capture (ASEL or VASEL), altitude hold (ALT or VALT)
vertical speed (VS), VNAV vertical path (VPTH), pitch hold (PIT), or glideslope track (GS) modes.
The airspeed control mode tracks the active airspeed (IAS) or Mach target. The airspeed target is
selected on the flight guidance panel and is modified by the FMS or manually.
GF1810_054
SPD SPD Knob
PUSH CHG
MAN
CRS 1 FMS
PUSH DCT
The airspeed control mode provides high and low speed protection. In the event that the active
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