Fleet Operator's Tool Kit >>
An auxiliary power unit (APU) is a device
on a vehicle whose purpose is to provide energy for functions other
than propulsion. Different types of APU are found on aircraft, as well
as on some large ground vehicles.
They are usually diesel powered. Gate installation of 400 Hz power and preconditioned
air units reduce the use of aircraft auxiliary power units (APUs),
greatly reducing emissions.
APUs In the News
UPS was recently
featured in an industry publication for its environmental initiatives.
Read the story
In late 2008, the U.S. Environmental Protection
Agency’s (EPA) Diesel Emissions Reduction National Program selected
UPS for an award of $473,939 to reduce particulate matter
generated by diesel engines at the company’s WorldportSM
global all-points air hub.
The EPA funding was disbursed to the Kentucky Clean
Fuels Coalition, which in turn distributed the monies to the UPS
Airlines. The grant will fund two projects to reduce particulate
matter: the replacement of diesel engines in ground support cargo
tugs and the extension of ground electricity to parked aircraft.
In the first project, UPS will replace diesel
engines in 92 tugs with much cleaner gasoline engines. Since the
particulate matter emissions are nearly zero for the new engines,
replacing the diesel engines will have the net effect of removing 5.3
tons of particulate matter per year from the air.
In the second project, UPS will install electric
units to power aircraft parked at Worldport, allowing them to avoid
the use of 26 diesel generators. Although commercial electrical power
does require burning fuel at a power plant, removing the diesel
generators from the airport will eliminate 2.2 tons of particulate
matter per year in Louisville.
These two projects are the latest contributions
toward UPS’s comprehensive sustainability strategy. The company’s
Louisville-based airline division has undertaken extensive efforts to
reduce fossil fuel consumption, minimize noise and reduce greenhouse
gas emissions by optimizing flight routes and speeds, managing
aircraft dispatch and taxi times, shutting down unneeded engines for
taxiing and experimenting with alternative fuels in ground support