ORDagent
Topic Author
Posts: 580
Joined: Wed Dec 17, 2003 6:24 am

Fuel Use Monitoring By Airlines.

Sun May 24, 2009 2:57 am

So if I'm a commercial airline pilot am I monitored for fuel usage? I'm assuming there are standards the airlines set for a specific route. Can a pilot be called to task for his uneconomic flying? Is it part of the revue process?
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Fuel Use Monitoring By Airlines.

Sun May 24, 2009 6:23 am



Quoting ORDagent (Thread starter):
So if I'm a commercial airline pilot am I monitored for fuel usage?

It depends on the airline but, generally, yes. They're typically more interested in the airplane's fuel usage, not so much the pilot, because fuel burn trends by airframe are good indicators of a building drag or engine problem. Also, you need to know the fuel burn correction for each aircraft to put in the FMC for route planning, and that changes with time.

Tom.
 
AirframeAS
Posts: 9811
Joined: Thu Feb 05, 2004 3:56 pm

RE: Fuel Use Monitoring By Airlines.

Sun May 24, 2009 7:17 am



Quoting Tdscanuck (Reply 1):

Doesn't that also depend on the hours that the engine has? One engine does not exactly burn or have the same consumption rate as another engine of the same type.
A Safe Flight Begins With Quality Maintenance On The Ground.
 
wilco737
Posts: 7279
Joined: Sun Jun 20, 2004 12:21 am

RE: Fuel Use Monitoring By Airlines.

Sun May 24, 2009 7:38 am



Quoting ORDagent (Thread starter):
So if I'm a commercial airline pilot am I monitored for fuel usage? I'm assuming there are standards the airlines set for a specific route. Can a pilot be called to task for his uneconomic flying? Is it part of the revue process?

Basically we can take as much fuel as we pilots want to. But of course if you always take 10 tons of extra fuel with you, then I am sure at one point the company will ask: why? If you always have good reasons, then nobody can do anything about it. But every pilot should think twice on how much fuel he takes with him. There are the required minimum fuel figure you have to have on board before leaving the gate.
We have a statistic how many flights needed more fuel than the calculated. Basically: how many flights needed contingency fuel or even extra fuel. It is a statistic value, so some flights needed more and some needed less. There are some routes where you know from experience where you usually need a tad more fuel due to arrival delay.

wilco737
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Fuel Use Monitoring By Airlines.

Sun May 24, 2009 3:31 pm



Quoting AirframeAS (Reply 2):
Doesn't that also depend on the hours that the engine has? One engine does not exactly burn or have the same consumption rate as another engine of the same type.

Yes. You need to trend by each engine (and by airframe), since the starting value will vary from engine to engine. The absolute number isn't as interesting as what it's doing over time, although if the actual value is way out of range that may mean something more wrong that just wear.

Tom.
 
AirframeAS
Posts: 9811
Joined: Thu Feb 05, 2004 3:56 pm

RE: Fuel Use Monitoring By Airlines.

Sun May 24, 2009 6:28 pm



Quoting Tdscanuck (Reply 4):
You need to trend by each engine (and by airframe)...

Why by airframe? Isn't engine king when doing this since the airframe doesn't do much other than fly? Or does the weight and balance have to be factored in?
A Safe Flight Begins With Quality Maintenance On The Ground.
 
Tristarsteve
Posts: 3359
Joined: Tue Nov 22, 2005 11:04 pm

RE: Fuel Use Monitoring By Airlines.

Sun May 24, 2009 6:49 pm



Quoting AirframeAS (Reply 5):
Why by airframe?

The drag of the airframes will be different.Bad fitting doors, loose flap seals, scab patches etc will add to the drag. Also the weight will increase over the years as dirt accumulates. Many years ago we had a VC10 which used more fuel than the average. It was weighed and found to be 300kg heavier than its last weigh. The sound proofing blankets in the freight holds had been fitted upside down with the drain holes at the top, and they were full of water.
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Fuel Use Monitoring By Airlines.

Sun May 24, 2009 6:55 pm



Quoting AirframeAS (Reply 5):

Why by airframe? Isn't engine king when doing this since the airframe doesn't do much other than fly?

Because the fuel burn factor that goes in the FMC is a composite of the engine and the airframe performance. You need to be able to separate the two. Aircraft drag tends to rise over time as repairs get applied, seals wear, potting compounds come out, etc.

Tom.
 
AirframeAS
Posts: 9811
Joined: Thu Feb 05, 2004 3:56 pm

RE: Fuel Use Monitoring By Airlines.

Sun May 24, 2009 9:12 pm



Quoting Tdscanuck (Reply 7):

Thanks for that info. I have not been assigned to work engines yet at F9, nor do I have the training yet, that is why I asked.
A Safe Flight Begins With Quality Maintenance On The Ground.

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