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80
70
60
50
40
T/O ROL AP1 TO
A/T1
SPD VAPP VNAV
500
ATT2
ADC1
20 20
10 10
10 10
200
45
6
4
3000
20
00
80
60
03
100
90
80
70
60
HOLD ROL AP1 TO
A/T1
SPD VAPP VNAV
500
ATT2
ADC1
20 20
10 10
10 10
200
65
6
4
3000
20
00
80
60
03
200
190
180
170
160
RETARD LOC AP1 GS
A/T1
SPD VAPP VNAV
1000
ATT2
ADC1
20 20
10 10
135
135
6
4
2000
60
40
20
07
200
190
180
170
160
T/O ROL AP1 TO
A/T1
SPD VAPP VNAV
1000
ATT2
ADC1
20 20
10 10
40
30 30
200
165
6
4
3000
20
00
80
60
08
Inflight below 400 feet AGL Inflight above 400 feet AGL
GX_17_008
For Training Purposes Only
Sept 04
17-61
P I LOT T R A I N I N G GU I D E
POWER PLANT
FLIGHT LEVEL CHANGE THRUST CONTROL MODE
The flight level change thrust control mode activates when crew selects the FLC mode
or when FMS engages the VFLC mode. The A/T selects the active upper/lower EPR
rating for climb/descent.
The active upper and lower EPR ratings are either computed from the phase of flight
or are pilot selected via an EPR rating menu.
For small flight level change climbs and descents, the A/T will provide thrust as
required to attain a programmed rate of climb/descent. The programmed rate of climb/
descent is proportional to the magnitude of the selected altitude change. Full power
climbs and full idle descents are achieved when the target climb/descent rate increases
beyond the capability of the airplane for the active upper and lower EPR rating.
When the selected altitude is captured, the thrust mode will automatically change to
SPD mode.
GX_17_009
Inflight TO mode selected on AP/FD
200
190
180
170
160
T/O ROL AP1 TO
A/T1
SPD VAPP VNAV
1500
1000
ATT2
ADC1
20 20
10 10
10 10
250
165
6
4
3000
20
00
80
60
11
GX_17_010
Inflight HDG and FLC selected on AP/FD
200
190
180
170
160
THRUST HDG AP1 FLC
A/T1
SPD VAPP VNAV
3500
ATT2
ADC1
20 20
10 10
10 10
250
165
6
4
35000
20
00
80
60
33
GX_17_011
Flight Level Change mode transition to SPD Mode
260
280
SPD HDG AP1 ASEL
A/T1
SPD VAPP VNAV
35500
ATT2
ADC1
20 20
10 10
10 10
290
255
6
4
35000
20
00
80
60
353
17-62 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
AIRSPEED CONTROL MODE
The airspeed control mode is the basic control mode of the A/T. Engagement of the A/
T system in-flight, with no AP/FD mode engaged, will result in the A/T engaging in
airspeed control mode. Airspeed control mode is also active if the A/T is engaged inflight
with the AP/FD engaged in:
• Altitude capture (ASEL)
• Altitude hold (ALT)
• Vertical speed (VS), pitch hold (PIT), or
• Glideslope track (GS) modes
The airspeed control mode tracks the active airspeed (IAS) or Mach target. The
airspeed target is selected on the flight guidance panel and is modified by the FMS or
manually. LIM is annunciated when the A/T cannot reach the speed target due to either
not enough thrust available to climb or thrust at IDLE and configuration will not allow
a deceleration.
The airspeed control mode provides high and low speed protection. In the event that
the active speed target is above the structural limits (Vmo, Mmo, Gear and Flaps
placards) minus 3 knots, the A/T will limit the speed to the lower of the appropriate
limits, as a function of airplane configuration, minus 3 knots.
In the event that the active speed target is below the lower speed limit, the A/T will
limit the speed to one of the following:
1. If the A/T is in approach mode (flaps 16 or greater and gear down, or GS mode
active) the minimum speed is limited to 1.3 Vs.
2. If the A/T is not in approach mode, the speed is limited to 1.2 Vs + 3 kts.
The SPD active mode will go to armed and LIM will be active.
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