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altimeter data is obtained via the EFIS.
Limiting
The A/T system provides speed and thrust envelope limiting. Thrust envelope limiting is based on
the active EPR rating, while speed envelope limiting is based on minimum speed limits as well as
placard and structural speed limits.
Monitoring
Monitoring is incorporated in the A/T system to ensure control integrity. The monitoring consists of
validity, servo response and pilot override monitoring. Validity monitoring ensures that all
parameters required for A/T control, during a specific phase of flight, are present and valid and
detects engine out, engine reversion, thrust reverser deployment and internal faults. The servo
response monitor compares the servo response with the commanded response to ensure the
integrity of the servo control system. The pilot override monitor detects pilot movement of the
thrust levers while the A/T system is engaged, to provide automatic disconnect of the A/T system.
POWER PLANT
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
18−10−31
AUTOTHROTTLE SYSTEM (CONT'D)
A/T 1 or 2 Select
To select an A/T, select MENU twice on the MFD control Panel, then select AUTOTHROTTLE 1 or
2 by toggling and select ENT.
GF1810_044
ETE1+36
12.5
KDVT
NM
WX
SYSTEM 2/3
FGC
AUTOTHROTTLE
1 2
1 2 SAT
GSPD
−56
TAT
TAS
−40
234
345 AUTOTHROTTLE 2 1
AUTOTHROTTLE 1 2
2
3
1
A/T Engagement/Disengagement
A/T Engagement
The A/T system is engaged or armed to engage by toggling the A/T engage/disengage
switch(es), located on either thrust lever.
GF1810_045
A/T ENGAGE/DISENGAGE
ANNUNCIATION
A/T MODE ANNUNCIATION
ACTIVE MODE GREEN (EXCEPT LIM)
ARMED MODE WHITE
190 ROLL 3 000
20 20
TO
180
170
160
150
145
6
1000
0500
HOLD
A/T1
SPD
Toggling the switches, while on the ground, during T/O phase, with the thrust levers less than
60% of max. thrust (23° TRA), will engage the A/T in an armed state. Subsequent advancement
of both thrust levers above 60% max. thrust, while airspeed is less than 60 knots, will result in
automatic engagement of the system into takeoff
thrust control, moving the thrust levers to the
appropriate thrust settings.
Toggling the switches, while on the ground, with the thrust levers greater than 60% max. thrust,
while airspeed is less than 60 knots, will engage the system directly into takeoff
thrust control.
Toggling the switches, while inflight, above 400 feet, will engage the system into a control mode
which is compatible with the active AP/FD mode. In the event that no AP/FD mode has been
selected, the A/T will engage into basic speed control mode.
Engagement is inhibited during a detected fault condition or during an invalid flight condition.
The A/T system can be disengaged manually and/or automatically.
POWER PLANT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
18−10−32
AUTOTHROTTLE SYSTEM (CONT'D)
A/T Engagement/Disengagement (Cont’d)
A/T Disengagement (Auto)
Automatic A/T disengagement will occur for any engaged or onground
armed state, in the event
of a detected system failure (abnormal disconnect) or when A/T control is inappropriate for the
current phase of flight (normal disconnect) such as on the ground, following touchdown. The A/T
annunciation will turn red and flash and an aural “AUTOTHROTTLE” is generated when the A/T
is disengaged automatically or manually, however the aural “AUTOTHROTTLE” is inhibited
following disconnect at landing.
GF1810_046
AUTOTHROTTLE
190 ROLL 3 000
20 20
TO
180
170
160
150
145
6
1000
0500
A/T1
A normal disconnect results in a 1 second aural warning as AT1 or AT2 is removed from the
PFD. An abnormal disconnect results in flashing AT1 or AT2 annunciation continuously, along
with a continuous aural warning, until the crew confirms the disengagement by pressing the
quick disconnect button (s).
POWER PLANT
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
18−10−33
AUTOTHROTTLE SYSTEM (CONT'D)
A/T Engagement/Disengagement (Cont’d)
Disengagement (Manual Override)
Manual disengagement of the autothrottle system, for both inflight and onground
operation, is
accomplished by the crew in the following manner:
· Pressing the quick disconnect button(s), located on either thrust lever, while the system is
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