Keywords: US Navy 050415-N-3122S-014 Aviation Machinist Mates, assigned to the Tigers of Patrol Squadron Eight (VP-8), work together to lower an auxiliary power unit (APU) of a P-3C Orion during maintenance.jpg en Okinawa Japan Apr 15 2005 - Aviation Machinist Mates assigned to the Tigers of Patrol Squadron Eight VP-8 work together to lower an auxiliary power unit APU of a P-3C Orion during maintenance The APU is a relatively small self-contained generator used to start the main engines with compressed air and to provide electrical power and air-conditioning while on the ground The APU can be operated in flight for electrical power use when bleed air is not available U S Navy photo by Photographer s Mate 3rd Class Shannon R Smith RELEASED 2005-04-15 050415-N-3122S-014 Navy http //www navy mil/view_image asp id 23675 U S Navy photo by Photographer s Mate 3rd Class Shannon R Smith PD-USGov-Military-Navy Images from US Navy location Okinawa Japan Patrol Squadron 8 United States Navy Auxiliary power units aircraft |