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In the event that a speed target is selected that requires an engine EPR higher than the
upper active EPR rating or lower than the active lower EPR rating, the A/T will limit
the commanded thrust to the appropriate EPR rating.
FMS SPD MAN
CRS 1
PUSH DCT
FD FLC
PUSH CHG
GX_17_012
SPD Knob
260
280
300
LIM HDG AP1 ALT
A/T1
SPD VAPP VNAV
35500
35000
ATT2
ADC1
20 20
10 10
10 10
280
265
6
4
35000
20
00
80
60
350
For Training Purposes Only
Sept 04
17-63
P I LOT T R A I N I N G GU I D E
POWER PLANT
RETARD MODE
The retard mode control provides a fixed-rate thrust lever retard of both thrust levers
to the idle position during airplane flare or landing. The A/T remain engaged until
touchdown to provide go around thrust if go around mode is selected.
The retard mode activates based on the radio altitude of less than 50 feet AGL, if the
airplane is in landing configuration (gear down and flaps ≥ 16°).
In the event that the airplane touches down without the A/T retarding the thrust levers,
due to failing to detect a landing configuration or lack of valid radio altitude. Upon
touchdown detection, the A/T will disconnect and throttle levers position and engine
rpm remain the same.
GO AROUND THRUST CONTROL MODE
The A/T go around mode provides a fixed rate thrust lever advance to the active upper
EPR rating in response to the activation of the AP/FD go around mode.
170
160
150
140
130
RETARD LOC AP1 GS
A/T1
SPD VAPP VNAV
1000
ATT2
ADC1
20 20
10 10
135
135
6
4
2000
20
00
80
07
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
GX_17_015
Example: Flare and less than 50 feet Rad Alt. Example: Touchdown
GX_17_016
Go Around Mode Activated
TOGA Switch Activated
200
190
180
170
160
GA ROL AP1 GA
A/T1
SPD VAPP VNAV
1000
ATT2
ADC1
20 20
200
165
6
4
2000
20
00
80
08
10 10
17-64 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
THRUST REVERSER SYSTEM
The thrust reversers provide additional deceleration to assist during landing and
rejected takeoff.
The thrust reverser is a pivoting door type. When deployed, the upper and lower doors
pivot to redirect exhaust gases through the top and bottom of the nacelle, eliminating
forward thrust and providing a braking effect. Each door has a kicker plate, attached to
its front edge, designed to ensure that the exhaust gases are ejected in the proper
direction.
In-flight the pivot doors are locked closed.
THRUST REVERSER
The thrust reverser is powered by hydraulic system No. 1 for the left reverser and
hydraulic system No. 2 for the right reverser, and is controlled by the EEC and
electrical signals from the airplane.
The hydraulic system comprises:
• Isolation Control Unit - controlled by the EEC
• Directional Control Unit - controlled by electrical signals
• Primary Lock Actuators - lock both upper and lower doors
• Door Actuators - one for each door
GX_17_075
THRUST REVERSER
OPERATION
BRAKES ONLY
BD 100
For Training Purposes Only
Sept 04
17-65
P I LOT T R A I N I N G GU I D E
POWER PLANT
The electrical system comprises:
• Tertiary Locks - one for each door, feedback signal to cockpit
• Stow Switches - two per door, stow signal feedback to EEC
• Linear Variable Transformer (LVT) - one per door, LVT signals door position to
EEC
• Maintenance Test Switch - allows thrust reverser deployment without engine
operating
GX_17_076
COCKPIT
CONTROLS
COCKPIT
INDICATIONS
WOW OR
WHEEL
SPIN UP
DAU’s
ISOLATION
CONTROL
VALVE
DIRECTIONAL CONTROL
VALVE
LVT
LVT
UPPER DOOR
ACTUATOR
STOW
SWITCH
MAINTENANCE
TEST SWITCH
TERTIARY
LOCK
STOW
SWITCH
STOW
SWITCH
STOW
SWITCH
LOWER DOOR
ACTUATOR
PRIMARY
LOCK
LH SIDE
PRIMARY
LOCK
RH SIDE
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航空翻译 www.aviation.cn
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