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function of HP compressor inlet temperature T26 and HP RPM. The
actuator operates the inlet guide vanes and bleed valve through signals
from the T26 and HP RPM.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-76-00
Page 3
May 31/01
Revision 4
D. Autothrottle:
(See Figure 1.)
NOTE:
On aircraft SN 1214 and subsequent, engine
synchronization is a function of the autothrottle
system. With the autothrottle engaged and ENGINE
SYNC selected, The autothrottle will sync the engines
when engine power is at limit EPR for CLB, CRZ or
MCT ratings. With engines at limit EPR, the
autothrottle will reduce RPM on the “high” engine to
match either LP or HP RPM. The other engine will
remain at the limit EPR.
(1) The PZ-800 performance computer aids the pilot in determining and
selecting the optimum airspeed/engine setting for any given flight
condition. The performance computer functions as an autothrottle
computer to directly control aircraft throttle settings and allows the
pilot to optimize thrust management.
The autothrottle uses the selected EPR rating as an upper limit for
control in all modes of operation. Automatic rating selection is
available, where the PZ-800 performance computer chooses the
engine rating based on the phase of flight. Also, minimum engine
limits are observed to avoid the nonlinear flat response area near
idle throttle settings.
(2) The following is a brief description of how the autothrottle system
operates in LP, HP and EPR synchronization:
• With autothrottles engaged, engine synchronizer functions
are performed through performance computers, not the
synchronizer system.
• When FLCH mode is selected or directed by climb power or
idle (as appropriate) and autothrottles are engaged, engines
are synchronized to EPR by performance computers
regardless of engine synchronizer selection. If engine
synchronizer is selected ON in this mode, the appropriate
lights will be illuminated even though LP and HP
synchronizers are inhibited. When not in FLCH mode with
autothrottles and engine synchronizer selected to ON,
engines are synced to LP or HP by performance computers
through switch selection.
• When not in FLCH mode and engine synchronizer is not
selected, engines will default to EPR synchronizer with
autothrottles selected ON.
(3) Autothrottle Control:
There are two types of autothrottle control modes:
Speed:
• Cruise
• Pitch hold, climb or descent
OPERATING MANUAL
2A-76-00 PRODUCTION AIRCRAFT SYSTEMS
Page 4
May 31/01
Revision 4
• Vertical speed, climb or descent
• V path
Power:
• FLCH climb or descent
• FLCH takeoff
• FLCH go-around
When autothrottle is engaged in a speed mode, performance computers
will equalize EPR unless LP or HP synchronizer is selected ON.
When autothrottle is engaged in a power mode, performance computers
will equalize EPR regardless of LP or HP synchronize selection.
E. Engine Synchronizer:
(See Figure 2.)
NOTE:
Prior to activating the sync system, the engines should
be manually synchronized by using the power levers
and the engine RPM indicators.
• Aircraft 1000 thru 1213 excluding 1183:
The engine synchronization system provides a means to
automatically match the LP or HP RPM of the left (slave) engine to
the right (master) engine over a limited, predetermined range. This
limited range prevents the left engine from losing more than a fixed
amount of RPM should the right engine be throttled back, shut down
or otherwise lose RPM. The engine synchronizing system consists
of an amplifier which is supplied with RPM signals from the HP and
LP tach generators. These signals are computed and an output
signal is sent to an actuator on the left engine. The actuator, in turn,
moves the RPM/FUEL lever on the fuel regulator to either increase
or decrease the RPM of the left engine to match the right engine.
The left engine power lever is not affected by actuator motion.
• Aircraft 1183, 1214 and Subsequent:
Engine synchronization is a function of the autothrottle system.
When FLCH mode is selected or directed by climb power or idle, as
appropriate, and autothrottles are engaged, engines are
synchronized to EPR by performance computers regardless of
engine synchronizer selection. If engine synchronizer is selected
ON in this mode, the appropriate lights will be illuminated even
though LP and HP synchronizers are inhibited. LP or HP sync will
only be active when the autothrottle is in the Speed Control Mode,
　
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