21.   The plant used no auxiliary power source but still kept the five-room home in Dover, Mass., cozy through the winter.

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 subway system, BART, continued running as usual, though two stations were closed because of a loss of auxiliary power.

24.   There is also an auxiliary power unit in the tail that runs on batteries and can provide power.

25.   Today every other major car company has a hybrid on the drawing boards or in research, generally with an internal-combustion engine as an auxiliary power unit.

26.   With no auxiliary power unit, the crew could not restart any of the four engines.

27.   An auxiliary power source was being used for navigation and a few other basic functions, said Kubal.

28.   He said the crew started smelling fumes after turning on an auxiliary power unit.

29.   The game clock continued to run, and some billboards remained illuminated with auxiliary power.

30.   The plane has two generators, plus an auxiliary power unit, but the pilot opted to return to the airport, airline spokesman Jack Evans said.