Learjet 60 - ENG SYNC Switches; Engine Synchronizer

Learjet 60

Pilot's Manual
APR ON LIGHT
If APR is activated automatically by the
FADEC, the amber APR ON
light on the glareshield annunciator panel
will illuminate once APR
thrust has been achieved . The APR ON
light will not illuminate if
APR thrust is obtained manually using the thrust
lever detent .
ENGINE SYNCHRONIZER
The engine synchronizer system
consists of two ENG SYNC
switches,
an
amber ENG SYNC light, and engine
synchronizer circuits within
the
FADECs . During flight, the
engine synchronizer, if selected, will
maintain the
two engines' Ni or N2 in sync
with each other . The en-
gine
synchronizer must not be used
during takeoff, landing, or single-
engine operations
. Engine synchronization is
not available on the
ground or
whenever APR is armed . Electrical
power for the engine
synchronizer
is 28 VDC supplied through
the 1-amp ENGINE SYNC
circuit
breaker on the pilot's circuit breaker
panel .
Synchronization
is accomplished by maintaining
the speed of the
slave engine in sync
with the speed of the master
engine . The master
engine is
determined and so designated during
installation . The fol-
lowing criteria must be satisfied before the system
will operate :
" The ENG SYNC switch is set to SYNC .
" The difference between the N1
speed of each engine is no
more
than 5% .
" Thrust levers are in the range from
IDLE to MCT .
" Thrust reversers are stowed .
" APR is disarmed .
Deviating
from any of these criteria will cancel
engine synchroniza-
tion . The system
will raise flight idle of the master
engine by a maxi-
mum of 1%Ni
when activated .
ENG SYNC
SWITCHES
Two ENG SYNC switches are installed on the
pedestal immediately
below the thrust levers . The ENG SYNC
control switch is labeled
SYNC-OFF and the ENG SYNC selector
switch is labeled N1-N2 .
When moved to the SYNC position, the
control switch will activate
the engine synchronizer and remove
Ni Indicator compensation ;
therefore, the Ni and Ni bug
presentations will reflect actual Ni
speed . WhenSYNC is selected, Ni
or
N2
synchronization is selected
by
moving the ENG SYNC selector switch to Ni
or N2 as desired .
PM-123
Change 2
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