gigneil
Posts: 14133
Joined: Fri Nov 08, 2002 10:25 am

A319 CFM Model Numbers Backwards

Sun Jan 05, 2003 4:41 pm

Has anyone ever noticed that an A319 with a CFM56-5A5, for example, is an A319-114, but one with a CFM56-5B6/P, a newer and more modern engine, is an A319-111?

I thought Airbus used the final field for engine revision number... did they renumber them suddenly or did they start off with the CFM56 engines numbered higher to lower?

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LY744
Posts: 5185
Joined: Sat Feb 03, 2001 11:55 pm

RE: A319 CFM Model Numbers Backwards

Mon Jan 06, 2003 5:59 am

I believe only the middle digit refers to the engine (its manufacturer to be precise). The 3rd one is supposed to represent some sort of non-engine related customer revisions, AFAIK.

LY744.
Pacifism only works if EVERYBODY practices it
 
gigneil
Posts: 14133
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RE: A319 CFM Model Numbers Backwards

Mon Jan 06, 2003 6:02 am

LY744-

No, the last digit does refer to engine version. For example the A330-343 is a Trent 772B-60, while the A330-342 is a Trent 772-60, and the A330-243 is a PW4168A while the 242 is a PW4168.

And so on.

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LY744
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RE: A319 CFM Model Numbers Backwards

Mon Jan 06, 2003 7:05 am

I stand corrected.

BTW, a -111 is a -5B5, a -112 is a -5B6/P. -113 = -5A4, -114 = -5A5. If the B5s and B6/Ps are indeed older versions, than it is truly very odd.  Smile

LY744.
Pacifism only works if EVERYBODY practices it
 
gigneil
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RE: A319 CFM Model Numbers Backwards

Mon Jan 06, 2003 7:18 am

The 5A is the older engine, the 5B is the newer engine.

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LY744
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RE: A319 CFM Model Numbers Backwards

Mon Jan 06, 2003 8:13 am

The first A319s delivered were powered by the 5B (A319-111, A319-112), and the 5As appeared later on. Therefore, the chronological system remained in place. The conclusion is that the 5A4 and 5A5 CFM-56's that are used on the A319 are less powerful, but they are actually newer than the 5B5's and 5B6's. The 5A1 is the original version for the A320 family dating back to the late 80's. For whatever reason Airbus/CFM added the 5A's to the A319 as an option, perhaps due to airlines seeking extra commonality with their older A320's, or perhaps due to acquisition/operation costs.

LY744.
Pacifism only works if EVERYBODY practices it
 
gigneil
Posts: 14133
Joined: Fri Nov 08, 2002 10:25 am

RE: A319 CFM Model Numbers Backwards

Mon Jan 06, 2003 8:16 am

How interesting. That explains why the A319 is the only one out of wack like that.

Northwest's have 5As, but they're one of the few.

Heh how did you find this out?

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LY744
Posts: 5185
Joined: Sat Feb 03, 2001 11:55 pm

RE: A319 CFM Model Numbers Backwards

Mon Jan 06, 2003 8:23 am

I looked on Bill Harm's census list, searched in the Tech Ops forum, (which brought me to this site), and the CFM website.  Smile

LY744.
Pacifism only works if EVERYBODY practices it

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