BOMBARDIER BD-100-1A10, Operating Manual

Page: 533 / 544

POWERPLANT
May 06/2005 Flight Crew Operating Manual Volume 2
REV 2 CSP 100-6
18-01-17
THRUST LEVERS
DESCRIPTION
The thrust lever quadrant contains the thrust levers, thrust reverse finger lifts, microswitches and internal locks and stops
necessary to control the engines in forward and reverse thrust.
COMPONENTS AND OPERATION
THRUST LEVERS
Thrust lever quadrant settings are MAX REV, REV, IDLE, CLB, TO, and APR. In addition, the range of movement of the
thrust lever between IDLE and CLB is defined as the cruise range.
The thrust levers incorporate both mechanical stops and soft detents.
Self-centering soft detents prevent the thrust levers from moving inadvertently.
FRICTION KNOB
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
micro switches that are housed within the thrust quadrant. The information is provided to the FADEC, the flight control
computers (FCC) and to the data concentrator units (DCU). Other aircraft systems are influenced by thrust lever position
are as follows:
- Landing gear warning system
- Takeoff configuration warning system
- Cabin pressurization
- Ground spoilers
TAKEOFF AND GO-AROUND (TOGA)
Takeoff and go-around (TOGA) switches are included in each thrust lever. When pressed, the TOGA switch signals the
flight control computers to modify flight director commands and the FMS position is updated through the flight manage-
ment computer(s).
THRUST REVERSE LEVERS
The thrust levers are linear throttles, which means that reverse thrust is not modulated by use of piggyback levers, instead,
the thrust reverser levers are lifted above a gate, which allows the thrust lever itself to translate aft to modulate the reverse
thrust level. The reverse thrust setting is for ground use only.