2006-09-23 21:02:37 · 10 answers · asked by What?? 2 in Cars & Transportation ➔ Aircraft
Are you asking for temp?? or ???
The APU is "Auxiliary Power Unit". It is a small jet engine that produces electric power to run the AC packs and other systems when the craft is not connected to ground power.
2006-09-23 21:07:55 · answer #1 · answered by Anonymous · 1⤊ 1⤋
Just an addition to your other answers - many airports prohibit the use of the APU when an aircraft is on a stand, because of noise and exhaust pollution.
The actual exhaust outlet of the APU can usually be seen at the very tip of the aircraft tail - it usually has a slight upturn in its shape.
2006-09-23 21:59:51 · answer #2 · answered by aarcue 3 · 1⤊ 0⤋
The APU is the auxilliary power unit, a small turbine engine used to generate electricity when the main engines aren't running (for instance while the aircraft is parked at the gate).
Because it is a turbine engine it will have an exhaust but is much smaller
2006-09-23 21:07:56 · answer #3 · answered by Rainman 5 · 0⤊ 0⤋
This Site Might Help You.
RE:
What is the APU exhaust in jet aircrafts ?
2015-08-19 00:15:20 · answer #4 · answered by Anonymous · 0⤊ 0⤋
I used to fly the BAe-146 which has 4 small jet engines and an APU in the tail so we joked that we had 5 closely spaced APUs and that if we lost an engine or two in flight we could always fire up the APU for added thrust.
2006-09-24 11:53:18 · answer #5 · answered by fnansen 2 · 2⤊ 0⤋
It's the air outlet from the APU (Auxiliary Power Unit), which is a small jet embedded in the tail to provide power to the airplane when the engines are not running.
2016-03-22 14:58:51 · answer #6 · answered by Anonymous · 0⤊ 0⤋
The APU is an airborne auxiliary power unit.. mostly operated on ground to provide electrical power and pneumatic air for aircraft systems and engines.. and because its an engine which use the same aircraft fuel there is intake and exhaust manifolds.
2006-09-23 23:51:34 · answer #7 · answered by s_i_l_e_n_t_d_u_d_e 2 · 0⤊ 0⤋
the APU (Auxhiliary Power Unit) acts as a built in hydraulic mule, airstart and GPU (Ground power unit) for the aircraft which is a small turbine usually in the back end. It provides hydraulic power for doors brakes and such, electric power for operations instead of battery power and provides pneumatic power which is sent through the engines to start them up (kind of like windmilling the engines) since they alone do not have starters.
All of your engines have this power but for one thing something needs to start those engines up and if there is a "quick-turn" at an airport where baggage, fuel, lav, and passenger service is needed the big engines need to be shut down for saftey sake. Also the main engines burn far more gas than an APU.
2006-09-23 21:20:02 · answer #8 · answered by Mike B 1 · 1⤊ 2⤋
Mike B answered best however, the engines do have starters, they are called "air starters" , to clarify the hydraulic power supplied would be through the electric hyd pumps.
2006-09-24 04:22:06 · answer #9 · answered by islander 5 · 1⤊ 0⤋
Hmm....it's an outlet for hot air!?!?!?!Doh!
1st answer was spot on.
2006-09-24 08:05:03 · answer #10 · answered by yeahbutnobut 3 · 0⤊ 0⤋