Discussion
Which control is most often given spoilers as an alternative at high speed?
Answer: C
Roll control is the one: aileron hinge moments and aeroelastic reversal both bite hardest in roll, so spoilers take over some or all of the function at high speed on many transports, with the outboard ailerons locked out. Pitch and yaw keep their conventional surfaces, powered where necessary. Trim is a function rather than an axis. The reason roll suffers first is partly that two surfaces must be moved at once and partly that the wing twists under aileron load.
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