OPERATIONS MANUAL

Flight Controls
Aileron Control:
Roll control— respectively, lateral control—is provided by inboard
and outboard aileron surfaces and various spoiler panels. They are
controlled by turning either of the two control wheels on the flight
deck. The two control wheels are mechanically interconnected;
however, if one wheel jams, the other unjammed wheel may move
independently when significant manual force is applied. Two cables
mechanically transfer the control wheel motion to central lateral
control packages (CLCPs) located in the wing gear wheel wells. CLCPs
and aileron programmers convert the pilot inputs to the respective
mix of surface position commands. These commands are transferred
to hydraulic PCPs located in the wings. The PCPs position the ailerons
and spoilers. The wing gear wheel wells also contain three autopilot
servos for lateral control which too provide mechanical inputs to the
CLCPs, and at the same time move the pilots’ control wheels through
the mechanical cable system.
The aerodynamic roll control sensitivity increases with airspeed. At
high airspeeds, to avoid overcontrolling, the aileron lockout system
keeps the outboard aileron surfaces in the neutral position. The lockout
process starts when the group A leading edge flaps are retracted, and
the airspeed rises above 238 kt or above Mach 0.53. The lockout process
will take circa 30 seconds. During this process, the outboard aileron
deflection ratio will gradually decrease from 100% to 0%. The reversed
process will start when the group A leading edge flaps are extended, or
when the airspeed is below 232 kt and below Mach 0.51. The aileron
lockout system is controlled by the SRMs.
Spoiler Control:
Six spoilers are installed on the upper surface of each wing. They are
numbered from 1 to 12, starting from the left. All spoilers, except for
number 6 and 7, support the ailerons for lateral control. The inboard
spoilers 3 through 10 also act as speedbrakes when the speedbrake
lever is extended. Spoiler mixers control the respective ratio between
aileron support and speedbrake function. On the ground, all spoilers
can be fully extended.
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