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20
2200 1070 2200
FUEL QTY (KG)
SLATS / FLAPS
TOTAL FUEL 5470
OIL PRESS
OIL TEMP
FF (KPH)
26
70
90
56
97
210
N2
ITT
80
15.0
600
90.2
DN DN DN
0
BRT
APR
0.9
VIB
F
AN
0.9
Primary Page
Vol. 1 20--20--7
POWER PLANT
Thrust Control REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
D. High Power Schedule
NOTE
There are no operational procedures in which the use
of this switch is required. Use of this switch is also
prohibited by limitations.
CAUTION
Use of APR may adversely affect engine life under
certain conditions (Refer to the Flight Crew Operating
Manual, Volume 2 -- LIMITATIONS, Power Plant).
High Power Schedule Pushbutton
Figure 20---20---7
Engine / Miscellaneous Test Panel
Center Pedestal
ON
HIGH PWR SCHEDULE (Guarded)
If selected, engines will operate on the one
engine inoperative power schedule. Engine
power (both) will advance to MCT if thrust
levers are in the CLIMB detent. Engine
power (both) will advance to APR if thrust
levers are in the TOGA detent.
E. N1 and N2 Synchronization
In the cruise range, thrust is set to a specific value by the FADEC based on throttle
position. Synchronization allows the FADEC to match the fan (N1) or the core (N2)
speed of the two engines for noise reduction. Synchronization is selected by using the
SYNCH switch on the engine control panel . The left engine is designated as the
master engine and the right engine will be slaved to it.
For N1 synchronization to be enabled, the right engine N1 must be within 1.5% of the
left engine N1.
For N2 synchronization to be enabled, the right engine N2 must be within 7.5% of the
left engine N1.
Vol. 1 20--20--8
POWER PLANT
Thrust Control REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Engine Synchronization Switch --- Engine/Micscellaneous Test Panel
Figure 20---20---8
SYNCH
Used to select engine synchronization.
N1 -- Matches the fan speed of the right
engine to the fan speed of the left engine.
OFF -- Selects synchronization off.
N2 -- Matches the core speed of the right
engine to the core speed of the left engine.
Engine / Miscellaneous Test Panel
Center Pedestal
ON
F. Engine Overspeed Protection
Engine overspeed protection is provided by the FADEC when the N2 exceeds 107%.
When an overspeed condition is detected, the FADEC energizes the overspeed
solenoid which closes the overspeed shutoff valve which causes the pressurizing and
shutoff valve to close (see section 55 of this chapter). This stops fuel flow to the
combustor and the engine flames out. The FADEC, detecting the flame out, turns the
ignition ON. When the N2 speed decreases below the overspeed threshold, the
overspeed solenoid is deenergized and fuel is readmitted to the engine for automatic
relight.
The overspeed circuits of both FADEC channels are active regardless of which FADEC
channel is in control. The FADEC will also close the pressurizing and shutoff valve if
three or more overspeed conditions have been detected within 30 seconds.
G. Engine N2 Indications When Using Wing Anti --Ice
Under certain flight conditions, when the engines are operating at idle, the engines may
not be able to provide sufficient bleed air flow to the wing anti--ice system
When the wing anti--ice is selected ON, the FADEC will provide a signal (based on
ambient conditions) to the N2 indicators which will display a partial white band below
the normal green band. Maintaining the N2 in the green operating range will ensure
sufficient bleed air flow is available to the wing anti--ice system. If the N2 decreases
into the white range, the N2 pointers and digital indications will turn white and the L (R)
WING A/1 caution message may be displayed momentarily until the N2 is increased
back into the normal green range.
Vol. 1 20--20--9
POWER PLANT
Thrust Control REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Thrust Control Engine Overspeed Warning <1001>
Figure 20---20---9
ENGINE OVERSPEED
L ENG FLAMEOUT
R ENG FLAMEOUT
L THROTTLE
R THROTTLE
L ENG SRG CLSD
R ENG SRG CLSD
L ENG SRG OPEN
R ENG SRG OPEN
ENGINE OVERSPEED warning (red)
Indicates that N1 or N2 has exceeded redline
for more than four seconds.
L or R ENG FLAMEOUT caution (amber)
Indicates flameout of respective engine,
FADEC was not successful with re--light
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