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What is the exhaust pipe on the rear of the Boeing 737 and 747 fuselage for?
Wiki User
∙ 14y ago
On the very rear of the fuselage of the B747 is a round exhaust for the Auxillary Power Unit(APU). Every large passenger aircraft has an APU that is used to provide electrical & hydraulic power to the aircraft while it is on the ground (or also in the air during an emergency). The APU is a small jet engine that runs off the same fuel as the jet engines that provide thrust to the aircraft. The Wikipedia link shows a view of the APU exhaust and a view of the engine. Link: http://en.wikipedia.org/wiki/Auxiliary_power_unit http://www.honeywell.com/sites/aero/Phoenix_Repair_Overhaul3_C5D5EB8A7-6730-18D1-F595-53107B90D5DA_HAF4748F3-42EF-F1E6-0E4B-B3C77023F099.htm
Wiki User
∙ 14y ago
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