ENG~SYNCHRONUER
The
engine synchronizer consists of
the
R ENG indicator, two
ENG
SYNC I
switches below the thrust levers,
an
amber ENG SYNC light
on
the
glareshield annunciator panel,
and
~
engine synchronizer control box.
During flight,
the
engine synchronizer, if selected,
will
maintain the right en-
gine Fan
Speed
(NIl or Turbine
Speed
(N2l
in
sync with left engine Fan
Speed (NIl
or
Turbine Speed
(N2l.
The
engine synchronizer must
not
be
used
during takeoff, landing
or
during single-engine operations.
The amber ENG SYNC light
will
be illuminated whenever the nose gear is
down
and
the
ENG SYNC SYNC-OFF switch is in
the
SYNC position.
The R ENG indicator provides
an
indication of right engine synchronization
with left engine Fan
(NI)
or Turbine
(N2)
speed.
The
indicator indicates fan
sync when
the
ENG SYNC selector switch
is
in
the
FAN
position and tur-
bine sync when
the
selector switch is in the TURB position. The indicator
can be used
to
manually synchronize
the
engine
or
to
monitor operation of
the automatic synchronizer.
The
indicator is operative whenever the right
fuel
computer is
On
and operative.
Automatic engine synchronization
can
be utilized whenever both
fuel
com-
puters are
On
and
operating and
the
ENG SYNC SYNC-OFF switch is set
to SYNC. Since
the
engine synchronizer authority is limited, the operator
should manually synchronize the desired parameter
(NI or
N2)
within
ap-
prOximately 2.5% before selecting SYNC.
-_NOTE
~
The engine synchronizer also provides electrical filtering
r
to
prevent
HF
radio transmission interference with
the
engine
fuel
computers.
FAA
APPROVED
4-30-76
REISSUED
2-25-81,
CHANGE
10
2-85
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