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Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
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 power-up.
In the following tables:
.
Cruise phase refers to all inflight phases except take-off, approach and go around.
.
The approach mode is based on flaps ≥ 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 T/O Phase
.
Trim activates when both thrust levers are set to a . No active trim commands. Trim commands position corresponding to a thrust setting greater are zeroed. than 60% maximum thrust.
.
Trims to higher of two EPR CMDs from FADECs.
Trims to T/O EPR setting when within trim authority
range.
Cruise Phase
. N1 Sync performed as thrust levers are moved between the active cruise rating and flight idle rate settings.
Approach Phase Approach Phase
. Trimming to the computed A/T EPR. . No active trim commands. Trim commands are zeroed.
GA Phase GA Phase
. Trims to higher of two EPR CMDs. Trims to GA
. No active trim commands. Trim commands EPR setting when within range of GA EPR rating.
are zeroed.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
N2 SYNC ON
A/T ON A/T OFF
T/O Phase
.
No active trim commands. Trim commands are zeroed.
Cruise Phase
.
N2 Sync performed as thrust levers are moved between the active cruise rating and flight idle rate settings.
Approach Phase
. No active trim commands. Trim commands are zeroed.
GA Phase GA Phase
. Trims to higher of two EPR CMDs. Trims to GA
. No active trim commands. Trim commands EPR setting when within range of GA EPR rating.
are zeroed.
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.
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