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CRJ-900 APU

Asked by: Patrick Flannigan 67 views

The mysterious "third engine" of the CRJ-900.

Most airliners and corporate jets have an extra engine known as an Auxiliary Power Unit, or APU.

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  1. kj on May 12, 2010

    An auxiliary power unit is a small turbine engine that provides back up electrical power and pressurized air for air conditioning and main engine start up.

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