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speed target is above the structural limits (Vmo, Mmo, Gear and Flaps placards) minus 3 knots,
the A/T will limit the speed to the lower of the appropriate limits, as a function of airplane
configuration, minus 3 knots. The SPD active mode will revert to armed and LIM will become
active.
GF1810_055
Example: VMO Exceedence 266 Knots
310 HDG 35000
20 20
ALT
300
280
A/T1
LIM
40000
AP1
SPD
265 350 00
6
In the event that the active speed target is below the slow speed limit, the A/T will limit the speed
to the slow speed limit to 1.2 Vs +3 knots when not in approach or 1.3Vs plus a wind gust
compensation (max. 5 knots) when in approach. Approach is either gear down and Flaps >15° or
GS mode engaged on AFCS.
GF1810_056
20 20
3000
00
160
140
110
280 HDG ALT 2000
25
A/T1
LIM AP1
SPD
150
Example: VMO Exceedence 124 Knots
130
120
125
4
6
In the event that a speed target is selected that requires an engine EPR higher than the upper
active EPR rating or lower than the active lower EPR rating, the A/T will limit the commanded
thrust to the appropriate active EPR rating.
POWER PLANT
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
18−10−40
AUTOTHROTTLE SYSTEM (CONT'D)
Retard Mode
The retard mode control provides a fixedrate
thrust lever retard of both thrust levers to the idle
position during airplane flare or landing. The A/T remains engaged until touchdown to provide go
around thrust if go around mode is selected.
The retard mode activates based on a radio altitude of less than 50 feet AGL, if the airplane is in
landing configuration (gear down and flaps ³ 16°).
In the event that the airplane touches down without the A/T retarding the thrust levers, due to
failing to detect a landing configuration or lack of valid radio altitude, the A/T will retard the thrust
levers to idle upon touchdown detection.
GF1810_057
Example: Flare and less than 50 feet Rad Alt. Example : Touchdown
20 20
1000
170
150
140
130
120
135 LOC GS 2000
A/T1
RETARD AP1
160
135
6
4
20 20
170
150
140
130
120
135
A/T1
160
135
6
4
7 40
1000
2000
7 00
500
500
Go Around Thrust Control Mode
The A/T go around mode provides a fixed rate thrust lever advance to the active upper EPR rating
in response to the activation of the AP/FD go around mode.
GF1810_058
Go Around Mode Activated
TOGA Switch Activated
200 ROLL 2 000
20 20
TO
200
190
180
170
A/T1
GA
165
6
1000
F3
LO
AP1
8 00
POWER PLANT
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
18−10−41
AUTOTHROTTLE SYSTEM (CONT'D)
Electronic Thrust Trim System (ETTS)
The electronic thrust trim system will command limited authority thrust. The trim system will assist
the A/T and crew at setting trimmed thrust. In addition the system will perform EPR, N1/N2
synchronization when selected by the crew. The engine trim operating mode (N1 SYNC, N2
SYNC, EPR CMD SYNC and NO SYNC) are selectable via the FMS CDU. Only one operating
mode can be active at a time. Selection of an operating mode arms the Sync system for
engagement, when the conditions and flight phase are appropriate.
N1 SYNC will be selected by default on FMS powerup.
In the following tables:
· Cruise phase refers to all inflight phases except takeoff,
approach and go around.
· The approach mode is based on flaps ³ 16° and landing gear down or the active AP/FD
mode being glideslope or glidepath capture.
· EPR sync is active throughout all phases of flight except for the landing.
· N1 and N2 sync are inhibited during the approach phase to prevent unwanted thrust
reductions, in the event of an engine out.
N1 SYNC ON
A/T ON A/T OFF
T/O Phase
· Trim activates when both thrust levers are set to a
position corresponding to a thrust setting greater
than 60% maximum thrust.
· Trims to higher of two EPR CMDs from FADECs.
Trims to T/O EPR setting when within trim authority
range.
T/O Phase
· No active trim commands. Trim commands
are zeroed.
Cruise Phase
· N1 Sync performed as thrust levers are moved
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