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CFM56 Jet Fuel Type?  
User currently offlineNDSchu777 From United States of America, joined Oct 2001, 419 posts, RR: 3
Posted (11 years 11 months 21 hours ago) and read 4216 times:

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!



7 replies: All unread, jump to last
User currently offlineRendezvous From New Zealand, joined May 2001, 528 posts, RR: 0
Reply 1, posted (11 years 11 months 21 hours ago) and read 4201 times:

Jet A-1 would seem logical.

User currently offlineJetmek319 From Germany, joined Sep 2003, 199 posts, RR: 1
Reply 2, posted (11 years 11 months 19 hours ago) and read 4188 times:

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!


Never, ever moon a werewolf !!
User currently offlineAAR90 From United States of America, joined Jan 2000, 3531 posts, RR: 44
Reply 3, posted (11 years 11 months 15 hours ago) and read 4178 times:

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!
User currently offlineB747skipper From , joined Dec 1969, posts, RR:
Reply 4, posted (11 years 11 months 10 hours ago) and read 4122 times:

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...
Happy contrails  Smile
(s) Skipper

User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 5, posted (11 years 11 months 7 hours ago) and read 4090 times:

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
User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 10
Reply 6, posted (11 years 11 months 3 hours ago) and read 4060 times:

what about jp-7? would any modern jet engine burn that stuff?

"...cannot the kingdom of salvation take me home."
User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 7, posted (11 years 10 months 4 weeks 1 day 8 hours ago) and read 4016 times:

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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