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ENGINE CONTROL
A
OFF OFF
O
P604_18_025
VIB Switch
POWER PLANT
18-20 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Thrust Levers
Description
The thrust lever quadrant contains the thrust levers, thrust reverse levers, microswitches
and internal locks and stops necessary to control the engines in forward and
reverse thrust.
Operation
Thrust Levers
Most functions of the thrust levers are conventional in operation. Thrust lever quadrant
settings are SHUTOFF, IDLE, and MAX POWER.
Mechanical Stop
A mechanical stop prevents the thrust levers from inadvertent movement. When the
thrust lever is at SHUTOFF, the thrust lever is mechanically locked in that position.
When the thrust lever is at idle, the mechanical stop prevents the thrust lever from
being accidentally moved to SHUTOFF. The mechanical stop is released by lifting the
idle/shutoff release latch on the thrust lever.
Friction Knobs
A friction knob allows the pilot to change the friction setting for the thrust levers.
Thrust Lever Position Measurement
Actual thrust lever positions are electrically measured by rotary variable differential
transformers (RVDTs) or sensed by microswitches that are housed within the thrust
lever quadrant. The information is provided to the N1 control amplifier, the flight
control computers (FCCs), and the data concentrator units (DCUs). Other aircraft
systems receive thrust lever position information, including:
• landing gear warning system
• takeoff configuration warning system
• cabin pressurization
• ground spoilers
Takeoff/Go-Around (TOGA) Switches
A takeoff/go-around switch is mounted on each thrust lever. When pressed, the TOGA
switch signals the flight control computers to activate flight director modes
accordingly.
POWER PLANT
For Training Purposes Only
May 03
18-21
P I LOT T R A I N I N G GU I D E
Thrust Reverser Levers
The thrust reverse levers control the operation of the thrust reverser system. See the
thrust reverser description in this chapter for further details.
Thrust Levers
Figure 18-12
MAX
POWER
IDLE IDLE
SHUT
OFF
SHUT
OFF
Thrust Levers, Left &
Right Engine
Idle/Shutoff
Release Latches
Thrust Lever
Friction Adjustment
Takeoff/
Go-Around Switches
Thrust Reverser
Lever
Thrust Reverser
Trigger
Max
Power
Idle
Shutoff
P604_18_026
POWER PLANT
18-22 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Thrust Reverser System
Description
The thrust reverser system is used to assist in stopping the aircraft on landing and
during a rejected takeoff (RTO). The system is operable on the ground only.
Operation
The thrust reversers are armed when the appropriate switches on the THRUST
REVERSER panel are selected to ARM and the respective 14th-stage bleed air shutoff
valves are opened. When armed, a L(R) REV ARMED EICAS advisory message is
displayed.
Reverse thrust is generated by blocking fan bypass airflow and redirecting it forward
through a series of cascade vanes. Bleed air from the 14th stage of the compressor
pneumatically activates a power drive unit (PDU), which mechanically moves the
engine translating cowls rearward by means of a flexible driveshaft and ballscrew
actuators. As the translating cowl moves rearward, blocker doors rotate to redirect fan
airflow forward through the cascade vanes.
Reverser deployment is accomplished by squeezing the thrust reverser triggers and
applying upward pressure on the thrust reverser levers. Thrust reverser lever
movement is initially restricted to approximately 20 degrees by a solenoid stop and a
reverse thrust lever lock. This locks the thrust lever in the IDLE position and prevents
thrust from being applied. When the translating cowl reaches full aft travel, the
solenoid stop is released, allowing the reverser lever to be operated through its full
range and reverse thrust to be applied.
During normal thrust reverser deployment, an amber REV icon appears in the engine
N1 gauge while the reverser is in transit. When the reverser is fully deployed, the REV
icon changes to green. Reverser deployment is achieved in approximately 5 seconds.
Anti-Ice Disable
On touchdown or during rejected takeoff with the wing and/or cowl anti-ice system
on, the anti-ice systems are automatically disabled while the thrust reversers are
activated. This disabling action redirects all 14th-stage bleed air to the thrust reverser
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