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FLAP POSITION INDICATION
Flap position is shown in a digital display on the (EICAS) and flight control synoptic page.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
10-02-07 SECONDARY FLIGHT CONTROLS (Cont) SPOILER SYSTEM
On the upper surface of each wing there are four spoiler panels. The two inboard panels are the ground spoilers, and the two outboard panels are the multifunction spoilers.
GROUND
The system is computer controlled and hydraulically operated, two ground spoilers provide ground lift dumping functions. The multifunction spoilers provide roll assist, proportional lift dumping and ground lift dumping functions.
The ground spoilers have only two positions: fully retracted during flight or fully deployed after landing. The inboard and outboard ground spoilers, when tied together with the multifunction spoilers, comprise the ground spoilers system.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
10-02-08 SECONDARY FLIGHT CONTROLS (Cont)
COMPONENTS AND OPERATION
SPOILER ELECTRONIC CONTROL UNIT (SECU)
Two electronic units, SECU 1 and SECU 2, control the spoilers. The SECUs contain all the functions necessary to transmit the spoiler sensor outputs and control the spoiler actuators. The SECUs also supply crew-alerting system messages, main-tenance messages, and flight-data recorder data.
FLIGHT SPOILERS LEVER
The flight spoilers lever provides symmetric deployment of two pairs of multifunction spoilers via the SECU. In normal operation there are nine detented positions between 0 and MAX. The 0 position is gated and requires pressing the push button on top of the lever to release. The 0 position can be reselected without pushing the button. A tenth position for emer-gency descent is also available. The EMER position is gated and requires pressing the push button to engage. The lever will return anywhere within the 0 to MAX position from EMER without pressing the button.
The spoiler graphic display on the top half of the left MFD declutters after 60 seconds when the spoilers are retracted. The graphic will automatically be displayed again when the ground or flight spoilers are extended or a spoiler failure exists.
May 06/2005 Flight Crew Operating Manual Volume 2 REV 2 CSP 100-6
10-02-09 SECONDARY FLIGHT CONTROLS (Cont)
ROLL SPOILERS
Roll spoilers assist is provided through the multifunction spoilers (MFSs) to assist the ailerons in providing roll control. Each panel is electronically controlled by the SECU, and operated by a single hydraulically actuated power control unit (PCU). Pilot inputs to the roll assist system are through the control wheels, and the ROLL SPOILERS switch located on the center pedestal
ROLL SPOILERS DISCONNECT
If the aileron cable system jams, the pilot must activate the roll disconnect feature on the pilot’s control wheel. This action disconnects the pilot’s wheel from the cable system, permitting continued roll assist by the pilot if the jam is not in the pilot’s wheel.
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