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FLIGHT CONTROLS Description Vol. 2 10.10.9
Oct 05/06
Mach Trim
At least one STAB TRIM channel must be engaged to have Mach trim engaged. The Mach trim system, when engaged and active, compensates for the rearward shift of the aerodynamic center of pressure as Mach number increases. The Mach trim system schedules inputs to the HSTCU to command movement of the horizontal stabilizer, when hand-flying at speeds greater than Mach 0.4.
Aileron Trim
Aileron trim is accomplished by activation of the AIL TRIM switches on the center pedestal. Actuation of both switches provides arming and directional signals, which bias the control circuits to actuate the PCUs and deflect the ailerons. Actuation of the aileron trim will cause the control wheels to deflect in the direction of trim input. Aileron trim position is indicated on the primary EICAS display.
Stab Trim Panel
Figure 10.10.5
Stab Trim Indications
Figure 10.10.6
FLIGHT CONTROLS Description Vol. 2 10.10.10
Oct 05/06
Rudder Trim
Rudder trim is accomplished by turning the RUD TRIM switch. Rudder trim input is applied by the trim actuator into the yaw damper/trim mixer assembly, and will supplement the primary rudder input, as applicable. Actuation of the rudder trim does not cause rudder pedal deflection. The rudder trim position is indicated on the EICAS page.
Aileron/Rudder Trim Panel
Figure 10.10.7
Aileron/Rudder Trim Indications Figure 10.10.8
Flaps
Two double-slotted flap panels (inboard and outboard) are externally hinged on the trailing edge of each wing. A flap lever, located on the center pedestal, sends a signal to the flap control unit (FCU) to initiate flap movement.
FLIGHT CONTROLS Description Vol. 2 10.10.11
Oct 05/06
The flaps may be set to one of four positions: 0, 20, 30, and 45 degrees. A flap gate is incorporated within the flap lever 20-degree detent. This minimizes the possibility of accidental flap retraction to 0 degrees during a go-around procedure. Flap position is displayed on the EICAS page and the FLIGHT CONTROLS synoptic page, in both analog (colored bar) and digital formats. The indications on the EICAS page are in view only if the flaps are extended, or if the landing gear is not up and locked.
Maximum Flap Speeds
NOTE
To prevent damage, maximum indicated airspeeds for each flap setting must not be exceeded. These are placarded on the instrument panel (See Airplane Flight Manual for current airspeeds).
Flap Control Unit
When the FCU commands a change in flap position, the flap brakes are released, and two AC-powered motors, mounted on a flap gearbox, are energized. The gearbox rotates flex shafts, which move the flap ballscrew actuators, extending or retracting the flaps. When the desired setting is reached, the motors are deenergized and the flap brakes are applied. The flaps are mechanically interconnected for simultaneous movement of the inboard and outboard flap sections.
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