Investigators, however, suspect that wear and tear on the rudder standby power control units on both aircraft could have contributed to the sudden rolls.
42.
It took the two spacewalkers about 3 1 / 2 hours to remove the old power control unit and plug in the new one.
43.
The FAA said problems were found with two of 36 power control units on rudders modified by Aero Controls Inc ., in Auburn, Washington.
44.
The power control unit, a device in the tail of the jet, operates somewhat like power steering in an automobile to control the rudder.
45.
_Installation of a new " servo valve " in the power control unit that Denton said would not cause the reverse movement under extreme conditions.
46.
Nearly 80 of the problems occurred in the past five years, about 20 of which resulted in replacement of the main rudder power control unit.
47.
The site of the suspected contamination is the servo valve, a piece of the power control unit about the size of a soft drink can.
48.
Late last year, Boeing recommended that 737 operators test the rudder power control units on the aircraft to see if they're at risk of jamming.
49.
NASA held off powering down Hubble until Grunsfeld and Richard Linnehan were ready to start disconnecting the old power control unit, an hour into their spacewalk.
50.
The power control unit in USAir Flight 427 had not been replaced, but Cline said an examination showed it was incapable of being thrown into reverse.
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