41. Conversely, Vettel retired early on due to power unit issues. 42. Underhill said the Olathe center's power units have been modified. 43. Both power units drove through a friction drive and belt to the rear axle. 44. The auxiliary power unit was run for six hours, but no neurotoxins were detected. 45. Westinghouse's power units had 1996 revenue of $ 3.08 billion. 46. The warning light indicated the plane's auxiliary power unit was on fire, officials said. 47. Shuttles have long used a chemical called hydrazine to run their auxiliary power units . 48. Jackson said an auxiliary power unit that froze up on ascent is now working. 49. The union's theory is this : Hydraulic fluid leaks into the auxiliary power unit . 50. The heart of the system is the power unit , which produces the suction for vacuuming.
