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2.7 mils, and
• Amber VIB icons appear on the N2 dials.
ENGINE CONTROL Panel
Figure 19−10−11
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.
POWER PLANT
Description
Vol. 2 19−10−17
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
THRUST LEVERS (CONT'D)
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; and
• 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.
Thrust Reverser Levers
The thrust reverser levers control the operation of the thrust reverser system. See the thrust
reverser description in this chapter for further details.
POWER PLANT
Description
Vol. 2 19−10−18
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
THRUST LEVERS (CONT'D)
Thrust Levers
Figure 19−10−12
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.
POWER PLANT
Description
Vol. 2 19−10−19
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
THRUST REVERSER SYSTEM (CONT'D)
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
though 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 PDU to ensure proper
operation.
POWER PLANT
Description
Vol. 2 19−10−20
REV 66, Feb 01/07
CL−604 Operating Manual
　
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