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TheSonntag
Topic Author
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Joined: Wed Jun 15, 2005 7:23 pm

### How Much Fuel Uses An APU?

Well, the topic explains my question... When an APU is run, let's say in an A320, how much fuel does it use per hour? Is it an efficient way to produce electricity?

doug_or
Posts: 3244
Joined: Sat Mar 18, 2000 9:55 am

### RE: How Much Fuel Uses An APU?

DHC-1/2/300 APU burns 100 lbs an hour running a pack and electrical
When in doubt, one B pump off

longhauler
Posts: 6488
Joined: Sat Mar 06, 2004 12:00 am

### RE: How Much Fuel Uses An APU?

An A320 APU burns about 120 Kgs/Hour with the electrics and bleeds on. And no, it is not that efficient, that is why we use ground power when we can.
Just because I stopped arguing, doesn't mean I think you are right. It just means I gave up!

amtrosie
Posts: 273
Joined: Thu Jan 06, 2005 6:44 am

### RE: How Much Fuel Uses An APU?

A 737-200 burns about 250 lbs. per hour with the packs on. Electricals do not load up the APU enough to make a difference.

A319XFW
Posts: 1519
Joined: Thu Nov 03, 2005 5:41 am

### RE: How Much Fuel Uses An APU?

The A320 FQIC assumes an APU fuel burn of 2.5kg/min (so 150kg/hour). this doesn't mean it actually uses that of course.

lowrider
Posts: 2542
Joined: Wed Jun 30, 2004 3:09 am

### RE: How Much Fuel Uses An APU?

 Quoting TheSonntag (Thread starter):Is it an efficient way to produce electricity?

More efficient than running an engine, but less so then using ground power. It is worth the loss to be able to operate without any ground equipment if necessary.
Proud OOTSK member

777wt
Posts: 828
Joined: Wed Jan 19, 2005 7:45 am

### RE: How Much Fuel Uses An APU?

 Quoting Lowrider (Reply 5):More efficient than running an engine, but less so then using ground power. It is worth the loss to be able to operate without any ground equipment if necessary.

Also safer and less FOD chance. APU sits high unless it's a 727.

Starlionblue
Posts: 20698
Joined: Fri Feb 27, 2004 9:54 pm

### RE: How Much Fuel Uses An APU?

 Quoting 777WT (Reply 6):APU sits high unless it's a 727.

In which case it's a weirdly engineered afterthought inside one of the main landing gear wells. Apparently many a pax has had a brown trouser moment when it has been started. It seems to sometimes throw a nice tongue of flame over the wing. Or so I hear.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo

mknies
Posts: 11
Joined: Sat Feb 18, 2006 2:58 pm

### RE: How Much Fuel Uses An APU?

I helped install and run an APU in a 727 for one of my AT classes at purdue. When we started it for the first time, i must confess, i was very startled; even with ear protection!
Cheers
~Knies

fr8mech
Posts: 8215
Joined: Mon Sep 26, 2005 9:00 am

### RE: How Much Fuel Uses An APU?

 Quoting Starlionblue (Reply 7):In which case it's a weirdly engineered afterthought inside one of the main landing gear wells. Apparently many a pax has had a brown trouser moment when it has been started. It seems to sometimes throw a nice tongue of flame over the wing. Or so I hear.

Ah yes, the torching B727 APU. A thing of beauty.
When seconds count, the police are minutes away, or may not come at all.
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Ego Bibere Capulus, Ut Aliis Sit Vivere

jetskipper
Posts: 559
Joined: Tue Jun 12, 2001 1:50 am

### RE: How Much Fuel Uses An APU?

The APU on the EMB-135/145 uses 160 Pounds/Hour with the packs selected on.

HAWK21M
Posts: 30130
Joined: Fri Jan 05, 2001 10:05 pm

### RE: How Much Fuel Uses An APU?

The B752 APU GTCP 331-200ER consumes approx 165kg/hr Max.
regds
MEL
I may not win often, but I damn well never lose!!!

PurdueAv2003
Posts: 243
Joined: Tue Dec 06, 2005 11:43 am

### RE: How Much Fuel Uses An APU?

 Quoting Mknies (Reply 8):I helped install and run an APU in a 727 for one of my AT classes at purdue. When we started it for the first time, i must confess, i was very startled; even with ear protection! Cheers ~Knies

I've run that APU a few times, myself. Too bad Purdue didn't spend the money to put real Jet-A in those planes. I think that caused most of the problems I dealt with.
Ptu = Ftu X Anet (not to be confused with a.net)

HAWK21M
Posts: 30130
Joined: Fri Jan 05, 2001 10:05 pm

### RE: How Much Fuel Uses An APU?

 Quoting PurdueAv2003 (Reply 12): Too bad Purdue didn't spend the money to put real Jet-A in those planes. I think that caused most of the problems I dealt with

If they did not.What did they use.
regds
MEL
I may not win often, but I damn well never lose!!!

fr8mech
Posts: 8215
Joined: Mon Sep 26, 2005 9:00 am

### RE: How Much Fuel Uses An APU?

 Quoting HAWK21M (Reply 13):If they did not.What did they use

Diesel.
When seconds count, the police are minutes away, or may not come at all.
It’s hard to win an argument with a smart person, but it’s damn near impossible to win an argument with a stupid person. ~B. Murray
Ego Bibere Capulus, Ut Aliis Sit Vivere

mknies
Posts: 11
Joined: Sat Feb 18, 2006 2:58 pm

### RE: How Much Fuel Uses An APU?

Actually, last year Purdue got a refurbished (i dont know if it was the original or not) APU, and we did run Jet A. Prof. Mick was in charge of that project, and i, as a lucky freshman , was allowed to work on it! I was also lucky enough to get a taxi slot for the 727 (with all of its one working engines, lol).
Cheers!
~Matt
BTW: How many other Purdue Staff/Faculty/Alumni/Students frequent this site?

PurdueAv2003
Posts: 243
Joined: Tue Dec 06, 2005 11:43 am

### RE: How Much Fuel Uses An APU?

 Quoting Fr8Mech (Reply 14):Quoting HAWK21M (Reply 13): If they did not.What did they use Diesel.

Actually, when I was at Purdue, the AT department purchased some fuel that could not be certified as Jet-A, but was at a higher grade than diesel. As it couldn't really be sold "as is" to any real operators, the University got it pretty cheap. And it was. I was to start the APU during my practical exam on a cold day in January. The fuel had congealed and couldn't make it through the lines. Luckily, as I followed proper procedure, I still received a sign-off for the APU portion.

On a side note, I personally think it should be a requirement that all of the Aero/Astro Engineering grads at Purdue (or anywhere, for that matter) to receive their A&P, as well. An engineering degree is a requirement for my job. However, with an A&P, I have found I have a much better insight into a/c than engineers that might have more experience, but lack the hands-on training. I also have a lot of respect for the guys that are out there doing the grunt work for the manufacturers and the airlines. I make an effort in my job to make their lives a little easier when I can.
Ptu = Ftu X Anet (not to be confused with a.net)

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