engine variants

[Razor2]

Is there a penalty for operating multiple variants of the same engine?

ie:
JT8D-15
JT8D-17
JT8D-17R

[DenisG]

As far as I remember - if I have not missed an important announcement - the engine series are decisive for the fleet commonality costs. The JT8D is the engine series, the -15, -17, and -17R are the engine variants, which so far do not impact on fleet commonality costs.

But search the forum, this is a commonly asked question.

Cheers,
Denis

[Curse]

Don't care about engine commonality, it's not worth.

Get what you need and if you have the choice go for the most economic engine variant.

[MRFREAK]

Don't care about engine commonality, it's not worth.

Get what you need and if you have the choice go for the most economic engine variant.

Which means, don't go after Ilyushin, Yakolev or Antonovs- 

Sorry Ilyushin 

[Ilyushin]

Which means, don't go after Ilyushin, Yakolev or Antonovs-  

Sorry Ilyushin  

What do you mean? That is irrelevant.

What Curse said is that you should get the same type aircraft regardless of the engines, and if you have the choice, get the same engines as you've already had. But if you cannot get the same aircraft with the same engines then it is not a problem.

Maybe in that case IL, Yak or An aircraft are a better choice, because they always have the same engines (there are a few exceptions. I can only think of An-140 right now, but I'm thinking from a JA point of view.)

[Curse]

What Curse said is that you should get the same type aircraft regardless of the engines, and if you have the choice, get the same engines as you've already had. But if you cannot get the same aircraft with the same engines then it is not a problem.

Nope. Get the most economic variant of the engines regardless what you already have in service.

[Ilyushin]

Nope. Get the most economic variant of the engines regardless what you already have in service.

For engines that burn 20 kg/hr less you pay a much higher lease price that does not compensate at all... Especially not in JA.

[Curse]

Obviously in this case you choose the variant that is economical for your purse and in terms of fuel burn.

To stick to Jet Age a good example would be the DC-8-62 or the B737-200Adv (Pratt & Whitney JT8D-17R vs. Pratt & Whitney JT8D-15).


But there's no need to watch out only for JT8D-17R if you are scanning the used market and send away lots of JT8D-15 etc...