NDSchu777
Topic Author
Posts: 389
Joined: Sat Oct 06, 2001 3:29 am

CFM56 Jet Fuel Type?

Thu Oct 09, 2003 2:57 pm

Does anyone know what type of jet fuel is typically used to operate a CFM56 engine? I need to know this for an assignment for my aircraft design class. Any help would be greatly appreciated!

Thanks!

~Nick
 
rendezvous
Posts: 531
Joined: Sun May 20, 2001 9:14 pm

RE: CFM56 Jet Fuel Type?

Thu Oct 09, 2003 3:05 pm

Jet A-1 would seem logical.
 
Jetmek319
Posts: 193
Joined: Fri Sep 26, 2003 8:02 am

RE: CFM56 Jet Fuel Type?

Thu Oct 09, 2003 4:08 pm

Really depends on which series engine you're looking at. The CFM56-3's prefer Jet-A or Jet-A1, but can be run on Jet-B with a couple of adjustments on the MEC. The CFM56-5 and -7 will only use Jet-A or Jet-A1 to the best of my knowledge.
Hope that helps a bit !
Good Luck in the class!

Jetmek319
Never, ever moon a werewolf !!
 
AAR90
Posts: 3140
Joined: Fri Jan 21, 2000 11:51 am

RE: CFM56 Jet Fuel Type?

Thu Oct 09, 2003 8:29 pm

AA's 738 (-7 engines) OpMan states:

Standard Fuels: Jet-A and Jet-A1
Alternate Fuels: JP-5 and JP-8
Prohibited Fuels: JP-4 and Jet-B

No explanations are given -- us "drivers" don't care anyway.  Wink/being sarcastic
*NO CARRIER* -- A Naval Aviator's worst nightmare!
 
Guest

RE: CFM56 Jet Fuel Type?

Fri Oct 10, 2003 1:38 am

You are looking at the FCU fuel specific gravity as the problem...
Jet A and Jet A-1 have specific gravity of .812 and .813 respectively...
Jet B (JP-4) is .78... Just a pilot here, but there should be a knob on FCU to adjust to fuel specific gravity... More of a MX experts subject here...
xxx
Happy contrails  Smile
(s) Skipper
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: CFM56 Jet Fuel Type?

Fri Oct 10, 2003 4:36 am

The naptha in the JP-4 is very bad for the insides of the HMU in the -7.
If it wasn't for that the engine really wouldn't care what went through it as long as it wasn't explosive and would burn smoothly.
All of the fuels mentioned are kerosene or diesel type fuels while JP-4 is Naptha based and Jet B is also a high volatility fuel.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
cancidas
Posts: 3985
Joined: Thu Jul 03, 2003 7:34 am

RE: CFM56 Jet Fuel Type?

Fri Oct 10, 2003 8:43 am

what about jp-7? would any modern jet engine burn that stuff?
"...cannot the kingdom of salvation take me home."
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: CFM56 Jet Fuel Type?

Sat Oct 11, 2003 3:24 am

JP-7 has been burned in CF-6-50's.
The system must be run on and purged by a neutralizing fuel for a minimum of one hour afterward. That's to keep it from corroding the seals and some other sensitive parts in the engine fuel system.
Not all operators have fuel controls with compatable seals, however. The good news is that I can't think of a single commercially available source for the stuff outside of the military.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533

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