N2 SYNC ON
EPR CMD 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
FADEC’s. Trims to T/O EPR setting when within trim
authority range.
T/O Phase
No active trim command. Trim commands are zeroed.
Cruise Phase
N2 Sync performed as thrust levers are moved between
the active cruise rating and flight idle rate
settings.Trimming to the computed A/T EPR.
Cruise Phase
N2 Sync performed as thrust levers are moved between
the active cruise rating and flight idle rate settings.
Approach Phase
Trimming to the computed A/T EPR.
Approach Phase
No active trim commands. Trim commands are zeroed.
GA Phase
Trims to higher of two EPR CMDs. Trims to GA EPR
setting when within range of GA EPR rating.
GA Phase
No active trim commands. Trim commands are zeroed.
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
FADEC’s. Trims to T/O EPR setting when within trim
authority range.
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
FADEC’s. Trims to T/O EPR setting when within trim
authority range.
Cruise Phase
Trimming to the computed A/T EPR.
Cruise Phase
Trimming to the average of the two EPR CMDs.
Approach Phase
Trimming to the computed A/T EPR.
Approach Phase
Trimming to the average of the two EPR CMDs.
GA Phase
Trims to higher of two EPR CMDs. Trims to GA EPR
setting when within trim authority range.
GA Phase
Trims to higher of two EPR CMDs. Trims to GA EPR
setting when within trim authority range.
For Training Purposes Only
Sept 04
17-55
P I LOT T R A I N I N G GU I D E
POWER PLANT
N1, N2, EPR CMD SYNC OFF
The phase of flight is determined by the electronic trim system and is based on the A/
T mode, as well as the active autopilot/flight director pitch mode.
The electronic trim system will hold trim commands at 60 knots during T/O roll in
order to prevent undesirable thrust changes during T/O phase between 60 knots and
400 feet. The trim commands cannot be changed, including deselection, until the
airplane transitions 400 feet above ground level.
SYNC ANNUNCIATION
A SYNC annunciation will be displayed on N1 or N2 or EPR, when the sync system is
engaged and is issuing electronic trim commands.
There will be no SYNC annunciation while:
• A/T is engaged with EPR CMD sync selected
• A/T is not engaged during T/O or approach phase with EPR CMD sync selected
The engine trim control is not available for the following conditions:
• Engine out condition
• While an engine is in reversionary control (N1 control)
• While data, required for control, is invalid
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 command. Trim commands are zeroed.
Cruise Phase
Trimming to the computed A/T EPR.
Cruise Phase
No active trim command. Trim commands are zeroed.
Approach Phase
Trimming to the computed A/T EPR.
Approach Phase
No active trim command. Trim commands are zeroed.
GA Phase
Trims to higher of two EPR CMDs. Trims to GA EPR
setting when within range of GA EPR rating.
GA Phase
No active trim command. Trim commands are zeroed.
GX_17_017
EPR
SYNC N2 93.4
START START
93.4
N1 SYNC
SYNC
17-56 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
A/T 1 OR 2 SELECT
AUTOTHROTTLE channel is automatically selected. To manually change the
selection, select MENU twice on the MFD control panel, then select
AUTOTHROTTLE 1 or 2 and select ENT.
NOTE
Unlike the autopilot computers, there is no automatic transfer
between Autothrottle Computer 1 and Autothrottle Computer 2.
A manual reversion must be done via the MFD control panel.
A/T ENGAGEMENT/DISENGAGEMENT
A/T Engagement - The A/T system is engaged or armed to engage by toggling the A/T
engage/disengage switch(es), located on either thrust lever.
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