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TheSonntag
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How Much Fuel Uses An APU?

Sun Mar 05, 2006 11:17 pm

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
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RE: How Much Fuel Uses An APU?

Sun Mar 05, 2006 11:24 pm

DHC-1/2/300 APU burns 100 lbs an hour running a pack and electrical
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longhauler
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RE: How Much Fuel Uses An APU?

Sun Mar 05, 2006 11:29 pm

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.
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amtrosie
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RE: How Much Fuel Uses An APU?

Sun Mar 05, 2006 11:46 pm

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
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RE: How Much Fuel Uses An APU?

Mon Mar 06, 2006 5:13 am

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
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RE: How Much Fuel Uses An APU?

Mon Mar 06, 2006 6:15 am

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.
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777wt
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RE: How Much Fuel Uses An APU?

Mon Mar 06, 2006 9:10 am

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.
 
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Starlionblue
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RE: How Much Fuel Uses An APU?

Mon Mar 06, 2006 9:16 am

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.
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mknies
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RE: How Much Fuel Uses An APU?

Wed Mar 15, 2006 6:58 am

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
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fr8mech
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RE: How Much Fuel Uses An APU?

Wed Mar 15, 2006 8:35 am

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.
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jetskipper
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RE: How Much Fuel Uses An APU?

Sun Mar 26, 2006 8:05 am

The APU on the EMB-135/145 uses 160 Pounds/Hour with the packs selected on.
 
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HAWK21M
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RE: How Much Fuel Uses An APU?

Sun Mar 26, 2006 6:17 pm

The B752 APU GTCP 331-200ER consumes approx 165kg/hr Max.
regds
MEL
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PurdueAv2003
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RE: How Much Fuel Uses An APU?

Sun Mar 26, 2006 8:37 pm

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.
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HAWK21M
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RE: How Much Fuel Uses An APU?

Sun Mar 26, 2006 9:06 pm

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
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fr8mech
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RE: How Much Fuel Uses An APU?

Sun Mar 26, 2006 11:57 pm

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
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mknies
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RE: How Much Fuel Uses An APU?

Mon Mar 27, 2006 7:34 am

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).
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PurdueAv2003
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RE: How Much Fuel Uses An APU?

Mon Mar 27, 2006 12:39 pm

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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