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speeds. SYNC mode may be selected by the crew for takeoff below 400 feet, but it is
inhibited in the automatic mode below 400 feet. N1 shaft speed, N2 shaft speed or
EPR mode can be synchronized.
The ETTS provides EPR trim, N1 synchronization, N2 synchronization, engage status
as well as fault annunciation on EICAS.
N1 SYNC will be selected by default on FMS power-up.
In the following tables:
• Cruise phase refers to all in-flight phases except takeoff, 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 glide path capture
• EPR sync is active throughout all phases of flight except for the landing
• N1 and N2 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
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
N1 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
N1 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.
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