21.   The safety panel heard separate testimony Wednesday that contaminated hydraulic fluid and wake turbulence created by another aircraft could have contributed to the inadvertent rudder movement.

22.   The source of the smoke was hydraulic fluid that had been sucked into an auxiliary power unit that provides air conditioning in the cabin, he said.

23.   The three solid rocket motors made so many corrections they used up all their hydraulic fluid and the main engine alone was not enough to steer the rocket.

24.   The valve in question controls the flow of hydraulic fluid that moves the rudder, a large vertical panel in the tail.

25.   The valve channels hydraulic fluid to a cylinder that controls a rod that pushes the rudder.

26.   They included ground beef contaminated by fecal material, and hydraulic fluid, peeling paint, and condensation coming in contact with processing equipment.

27.   They were also used as coolants, lubricants and hydraulic fluids.

28.   They send electronic signals and hydraulic fluid through hoses and cables in each whale, which uses hydraulic pistons run by servo valves.

29.   They wore special diving suits to protect their skin from fuel and hydraulic fluid in the water.

30.   They wore special diving suits to protect their skin from jet fuel and hydraulic fluid in the water, officials said.