upper wing surface devices and their deflection is always asymmetrical.

lower wing surface devices and their deflection is always asymmetrical

upper wing surface devices and their deflection can be either symmetrical or asymmetrical.

lower wing surface devices and their deflection can be either symmetrical or asymmetrical.

A engine compressors. 

single radial compressors. 

ram air intakes.

piston compressors. 

a leak in the reservoir return line.

the pump output pressure being insufficient.

the hydraulic system accumulator becoming deflated.

the reservoir level being at a minimum acceptable level.

1,4 and 5.

1, 2 and 4.

3,4 and 5.

2, 3 and 4.

towards the side with more flaps and have a yawing moment to the same side.

towards the side with more flaps and have a yawing moment to the opposite side.

towards the side with fewer flaps and have a yawing moment to the opposite side.

towards the side with fewer flaps and have a yawing moment to the same side.

flow control valve.

shutoff valve

distribution valve

check valve.

whenever the landing gear position is not consistent with landing gear selector lever position.

whenever the landing gear selector is not in the neutral position.

when gear selection is performed above the gear limit speed.

whenever the gear is erroneously selected to retract on the ground.

a gradual decrease in the circumferential movement of the tyre due to wear.

the increase in inflation pressure due to decrease in ambient temperature.

the circumferential movement of the tyre in relation to the wheel rim.

the decrease in inflation pressure due to increase in ambient temperature.

the pilot does not feel any force when moving that control surface in flight.

there is a need to lock the flight controls on the ground.

there is no feedback to the pilot's controls of the aerodynamic forces acting on the control surface.

the flight control system has an alternate means of control in case of a control jam.

leading edge.

trailing edge close to the wing root.

trailing edge close to the wing tip.

trailing edge.