1.   But they had to use shards of metal far larger than what the filter system would have taken out, and the experiment left scars on the hydraulic unit.

2.   Newer hydraulic units rearrange the channels so that reversal is not possible, the aviation agency said.

3.   The city has found at least seven other trucks with cracked or loose pins in their hydraulic compacting units.

4.   Although the hydraulic units are not needed in orbit, they are essential during launch and landing, controlling wing flaps and the main landing gear.

5.   Columbia headed home with just two fully functioning hydraulic units, which provide the power needed to move the body flaps, rudder and landing gear.

6.   The workers appreciated the way Roekke strode through the shops and traded shop talk about work packages, welding sequences and hydraulic lifting units.

7.   A hydraulic unit control on the space shuttle Atlantis malfunctioned Monday after liftoff, but the problem did not compromise the mission, a NASA spokesman said.