Honeywell
4. c.
(8)
Engine Sync
The engines may be selected
MAINTENANCE
MANUAL
GULFSTREAMIV
to sync to either N1 (LP) or N2 (HP).
This w;ll be djsplayed on the engine instruments display. Whenever
the autothrottles are engaged, the aircraft engine sync system is
disabled and the autothrottles will sync LP
or HP for the engines
when in the autothrottle speed hold mode, annunciated as
IAS, or
MACH in the autothrottle window on the PFD. The autothrottles will
equalize EPR when in the autothrottle FLCH, TO, or GA
modes.
Table
210 lists how engine synchronization is performed by the
autothrottles.
Flight
Director
Autothrottle Parameter
System Providing
Mode Mode Sync’ed
Sync Function
N/A Not Engaged LP or HP
Aircraft System
DESCENT
IAS, MACH,
2
DEG PLA
VIAS, VMACH
FLCH
CLIMB
Autothrottle
EPR
I
TO
I
TO I EPR I Autothrottle I
I
GA
I
GA
I
EPR
I
Autothrottle
I
ALT, VALT
ASEL, VASEL
IAS or MACH LP or HP
Autothrottle
Vs
VPATH
GS
PITCH HOLD
Engine Synchronization
Table 210
22-14-00
Page 298.202
Apr 15/93
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