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control unit. This circuit allows the arming solenoid valve within the
flap power unit to energize open for 75 seconds and then de-energizes.
Normal flap extension from 0° to 40° will not exceed 10 seconds with
engine-driven hydraulic pumps operating. However, this time will extend
up to 60 seconds when using HYD XFLOW while lowering flaps
from 0° to 20° in flight.
FLAP POSITION INDICATION
The flap position indicating unit has two separate and independent
channels. Channel 1 provides left side equipment and Channel 2 provides
right side equipment. Both channels are housed in a common
chassis. Flap position is shown full time in a digital display on the
Engine Indicating and Crew Alerting System (EICAS). The EICAS display
is framed with a white box when the flaps are not in the selected
position in flight, or on the ground with flaps not set for takeoff. The
EICAS display turns red if power is advanced for takeoff and flaps are
not properly set. The display turns amber if there is a fault or failure in
the flap system. Flap selection and position are also displayed on the
right side of the FLT (flight) system schematic page. The FLT system
schematic display can be displayed on the EICAS or Multi-Function
Display (MFD).
Pilot’s Manual
PM-126A 5-9
Selected flap position is indicated by a horizontal magenta line across
the vertical scale. Actual left and right flap position is indicated by flap
position pointers on each side of the vertical scale. When flaps have
moved to their selected position, the pointers will overlay the magenta
line. Flap position pointers turn red on the ground when power is advanced
for takeoff and flaps are not properly set. Pointers turn amber
when there is a fault or failure in the flap system. A digital indication of
flap position is provided on the backup engine/systems page of the
Radio Management Unit (RMU).
SPOILER SYSTEMS
Spoilers, one on the upper surface of each wing forward of the flaps, are
provided for deceleration. The spoilers are electrically controlled and
hydraulically operated. The spoilers are extended symmetrically for
use as spoilers/speed brakes or asymmetrically for aileron augmentation.
Each spoiler is hinged at four points and is extended or retracted
with a single hydraulic actuator. The spoiler control lever, located on
the left side of the throttle quadrant, is linked to two RVDTs. There are
three labeled settings for the spoiler lever that correspond to detent positions:
RET (retract), ARM (autospoilers), and EXT (full extension) -
approximately 60° at slower airspeeds. The range between the ARM
and EXT detents allow for variable spoiler positions in flight. There are
also two unmarked detent positions between ARM and EXT which correspond
to intermediate spoiler extension positions of approximately
15° and 30°. At high airspeeds the actuators cannot extend the spoilers
fully; therefore, spoileron computer commands to the actuator servos
are limited by airspeed inputs from the Air Data Computers (ADCs).
At speeds below 175 knots, spoilers will extend to 60° when the spoiler
control lever is placed to EXT; however, at higher speeds full extension
is not possible.
Pilot’s Manual
5-10 PM-126A
NORMAL SPOILER MODE
The spoilers can be extended symmetrically on the ground or in flight
by moving the spoiler lever aft of the ARM position. Placing the lever
to any position aft of ARM while on the ground will cause full extension
(60°) of the spoilers. Spoiler extension on the ground requires approximately
1 second and in flight, approximately 5 to 7 seconds. When
the spoiler control lever is placed aft of the ARM position, the RVDTs
will signal the spoileron computer. The computer, in turn, energizes
torque motors on the servo valves to meter hydraulic pressure to the
extend side of the actuators. The computer receives spoiler extension
feedback from the RVDTs attached to the spoiler surfaces, and neutralizes
the servo valves when the spoilers reach their selected position. In
flight, the amount of spoiler extension will depend on spoiler control
lever position and airspeed.
AUTOSPOILERS
Autospoiler mode is used to automatically extend spoilers on landing
or in an aborted takeoff. When the SPOILER lever is set to ARM, the
system will arm and CAS will illuminate. This will automatically extend
spoilers when the main gear weight-on-wheels switch circuits indicate
an “on ground” condition, thrust levers are in the IDLE position
and the airplane has attained 60 knots ground speed. This mode fully
extends spoilers at maximum rate (one second or less) when spoiler
　
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