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abnormal condition in flight. During autostow, hydraulic pressure is
applied to the stow side of the primary actuators and the blocker doors
move towards the overstow position. As the doors reach overstow, the
spring-loaded latches close. When the latches close, the unlock switches
are deactivated. The selector valve then releases stow pressure on the
primary stow/deploy actuator. Exhaust gas pressure and springs return
the doors to the normal stowed position.
An automatic throttle retard mechanism is installed on each thrust reverser
to ensure that thrust reverser stow and deploy does not occur
with an engine thrust setting above idle. The throttle retard mechanism
consists of an actuator, crank, and lever. Whenever hydraulic stow
pressure is applied to the thrust reverser actuators, the throttle retard
mechanism will position the thrust lever to the IDLE position. When
hydraulic stow pressure is removed, the mechanism will return to a
neutral position and release retard pressure to the thrust lever.
THRUST REVERSER LEVERS
A thrust reverser control lever for each thrust reverser is mounted
piggy-back fashion on each main thrust lever. The thrust reverser levers
are inoperable and cannot be moved unless the associated main thrust
levers are at the IDLE stop. Similarly, the main thrust levers cannot be
moved from the IDLE position until the associated thrust reverser lever
is in the stow (full down) position. When fully armed, a thrust reverser
may be independently deployed by lifting the corresponding thrust reverser
lever to the first (idle/deploy) stop. A throttle release will activate
and the thrust reverser lever may be pulled beyond the idle/
deploy stop to increase reverse thrust. If both thrust reversers are deployed,
a detent limits thrust reverser lever travel to approximately
MCR.
The thrust reverser is stowed by first returning the thrust reverser lever
to the idle/deploy stop and then moving the lever to the stow (full
down) position at engine idle speed.
Pilot’s Manual
2-26 PM-132A
THRUST REVERSER INDICATIONS
Thrust reverser control is automatic and status indications are displayed
on the EICAS and CWP. The following EICAS illuminations are
specific to the thrust reversers:
During normal thrust reverser deployment the following illuminations
will occur:
1. REV white EI.
2. UNL amber EI.
3. DEP green EI.
During normal thrust reverser stowage the above illuminations will be
reversed.
The CWP contains red L and R REV UNSAFE lights which will illuminate
in conjunction with a UNL or DEP red EI above the N1 indicator.
Whenever this illumination occurs, a continuous “LEFT” or ”RIGHT
REVERSER UNSAFE” voice message will sound. This voice message
can be silenced by depressing the mute switch located on the right
thrust lever or depressing the master CAUT/WARN light.
EICAS Color Description
DEP (EI) Red Uncommanded deployment of the associated (L
or R) thrust reverser.
DEP (EI) Green Normal thrust reverser deployment on the ground.
REV (EI) Amber The associated (L or R) thrust reverser system is
armed in flight or on the ground with thrust lever
greater than MCR.
REV (EI) White The associated (L or R) thrust reverser system is
armed on the ground with thrust lever in IDLE.
REV AUTOSTOW White The associated (L or R) thrust reverser autostow
function is activated.
REV FAULT White A fault is detected in the associated (L or R) thrust
reverser system.
UNL (EI) Red The associated thrust reverser system is not
armed, but an unlock condition is detected.
UNL (EI) Amber On the ground, the thrust reverser is in transition
between stow and deploy. It will temporarily illuminate
during normal thrust reverser deployment. If
illumination continues for more than several seconds,
an abnormal condition exists and the master
caution is tripped.
Pilot’s Manual
PM-132A 2-27
THRUST REVERSER SYSTEM SCHEMATIC
Figure 2-4
L R TR AUTOSTOW (white)
L R REV UNSAFE (red)
L R TR FAULT (white)
CAS MESSAGES
LOWER
BLOCKER
DOOR
UPPER
BLOCKER
DOOR
PRIMARY
DEPLOY/STOW
ACTUATOR
STOW
DEPLOY
ELECTRICAL
UNLATCH
RETURN
PRESSURE
MAIN
HYDRAULIC
SYSTEM
THRUST REVERSER
ISOLATION VALVE
THRUST REVERSER
CONTROL UNIT
FULL DEPLOY
SWITCH
UNLOCK
SWITCH
UNLATCH
ACTUATOR
LATCH
HOOKS
THROTTLE
RETARD
MECHANISM
UNLATCH
SWITCH
THRUST REVERSER
CONTROL VALVE
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