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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 SHUT OFF, IDLE, and MAX POWER.
POWER PLANT Description Vol. 2 19.10.18
Oct 05/06
Mechanical Stop
A mechanical stop prevents the thrust levers from inadvertent movement. When the thrust lever is at SHUT OFF, 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 SHUT OFF. The mechanical stop is released by lifting the idle/shutoff release latch on the thrust lever.
Friction Knobs
A friction knob is set to a preset friction value for ATS operation, and is not adjustable by the pilot.
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:
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Landing gear warning system;
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Takeoff configuration warning system;
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Cabin pressurization; and
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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.
Autothrottle System (ATS) Disconnect Switches
These switches, on the forward face of each thrust lever (ATS DISC), are associated with the autothrottle system (ATS). In addition to control through the ATS control panel on the glareshield, ATS disengage is also provided by these disconnect pushbutton switches.
Thrust Reverse Levers
The thrust reverse 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 19.10.19
Oct 05/06
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 advisory EICAS message is displayed.
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