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Online Airline Management Simulation
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Author Topic: Fleet Commonality  (Read 1318 times)

Airframe

  • Former member
Fleet Commonality
« on: April 25, 2010, 02:14:35 AM »
Hey guys, can someone explain the specifics of fleet commonality for me?  I understand the realism of fleet commonality savings, but I am curious as to how the game works....

 For example...
DC-9-10
DC-10-10

Are they common because of their same manufacturer? or no?

737-200
737-300

Are they common because of their same family?

Are there varying degrees of commonality?

Thanks for any info that can be provided

Offline schro

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Re: Fleet Commonality
« Reply #1 on: April 25, 2010, 02:18:10 AM »
Commonality is based on the same family. Manufacturers are not considered common across different families. Generally they must have the same cruising speed and other characteristics.

All DC-9's (10-50) are the same type, as are all DC-10s (10-40)

737 100/200 are the same type, as are the 737 classics (300-500) and NGs (600-900)

If you think along the lines of what a common type rating for a pilot would be, then that should give you the general rule for commonality grouping...

No different degrees of commonality - engine types play a minor role, but thats secondary and not nearly as costly.

Your fleet commonality expenses go up exponentially every 3rd fleet type across all fleet types (so when you add number 4, 7, 10, etc).  From what I've seen, I was paying about double for all fleet types when I added number 4...

DenisG

  • Former member
Re: Fleet Commonality
« Reply #2 on: April 25, 2010, 02:21:16 AM »
Ansolutely correct. Too bad I haven't taken notes, but I had the impression (gut feeling) at the beginning of the scenario that as I added a new engine type in my B737-200Adv. series, I was also going up quite impressively with fleet comm. costs. Perhaps 100k-150k I would say. But I cannot confirm this, just to put a question mark on it.
Denis

aadriian

  • Former member
Re: Fleet Commonality
« Reply #3 on: May 15, 2010, 08:46:15 PM »
I did lease two planes in the same family, but with different engines. And then i noticed that i went up 100-150k on the maintenance costs, just because of the different engines.

Offline Sigma

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  • Posts: 1920
Re: Fleet Commonality
« Reply #4 on: May 16, 2010, 05:07:37 AM »
I did lease two planes in the same family, but with different engines. And then i noticed that i went up 100-150k on the maintenance costs, just because of the different engines.

Your maintenance costs went up because you got a 2nd plane, not because it had a different engine than another.

Engine commonality is separate but extremely minor.  Get a 2nd plane of the same type with same engine and notice how much the engine maintenance costs go up.  Then get a 3rd plane same type with a different engine, and see how much the engine maintenance costs go up.  It's virtually no different, per engine, whether it's the same engine as you currently operate or a different engine, the increase in engine maintenance costs is about the same regardless. 

I've also not seen the same penalty that is found with fleet types -- i.e. I've operated MANY different types of engines, and never has there been an appreciable impact on the maintenance costs of existing engine models whenever I add a new one.

Offline swiftus27

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Re: Fleet Commonality
« Reply #5 on: May 16, 2010, 11:28:00 AM »
From my Newb guide...

FLEET COMMONALITY 

Consider this; you have been tasked to maintain a fleet of cars.  Letís say that you own a Ford, Toyota, Nissan, Kia, and a BMW.  You would have to keep a lot of tools and technical manuals to keep them all running at peak efficiency. If you have a fleet of five Chevrolets, you only need to buy the parts and manuals for Chevrolets.    The same holds true in AWS.   

Commonality is broken down into the following categories: 
  1. Manufacturer (Boeing, Airbus, McDonnell Douglas)
  1a. Airplane Series   (737, A300, DC-10)
  1b. Sub-Type   (737 100-200, 300-600, 700-900)
  2. Engine Manufacturer (Pratt-Whitney, Rolls Royce, General Electric)
  2a. Engine Series   (Pratt-Whitney JT7D, JT8D, JT9D)
  2b. Engine Sub Type   (Pratt- Whitney JT8D-15, JT8D-15A, JT8D-17A)

Offline Unbornio

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Re: Fleet Commonality
« Reply #6 on: May 16, 2010, 12:26:36 PM »
Commonality is broken down into the following categories: 
  1. Manufacturer (Boeing, Airbus, McDonnell Douglas)
  1a. Airplane Series   (737, A300, DC-10)
  1b. Sub-Type   (737 100-200, 300-600, 700-900)
  2. Engine Manufacturer (Pratt-Whitney, Rolls Royce, General Electric)
  2a. Engine Series   (Pratt-Whitney JT7D, JT8D, JT9D)
  2b. Engine Sub Type   (Pratt- Whitney JT8D-15, JT8D-15A, JT8D-17A)
--

There is no manufacturer commonality. there is no Airplane Series commonality.There is no engine manufacturer commonality. There is no Engine Sub Type commonality.
Beta Tester

Offline swiftus27

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Re: Fleet Commonality
« Reply #7 on: May 16, 2010, 03:45:57 PM »
read the whole chapter 1 of the newb guide... it says that some sections don't add to cost.  It is simply how the page is divided. 

there IS an airplane series commonality (I have no idea how the above poster doesn't think so... my A310s are not in the same fleet group as my 727s or A320s) .  There IS a sub-type commonality (Explain that to those airlines using the 732as and 733s)  There IS an engine series commonality (My Int'l Aero engines aren't in the same group as the CF6s or how my JT8s are separated from my JT9s).


Offline Sigma

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Re: Fleet Commonality
« Reply #8 on: May 16, 2010, 08:43:05 PM »
Unbornio was referring to the penalities that exist, not necessarily whether or not they are technically divided into separate commonality groups on the screen or not.  That's simple the way the table displays them, not whether or not they're impacting costs.

And the only thing your guide says doesn't impact costs is Engine Sub-type commonality.  When in fact, there's only a single thing that impacts commonality costs in this game, and that's what you call "Model Sub-Type."

You get no benefit at all for sticking with the same manufacturer (i.e. if you fly 737s, you'll take the same commonality hit for flying 767s as A330s).
You get no benefit at all for sticking with the same series (i.e. you get the same commonality hit for adding 737NGs to your fleet of 737-300s as if you added, say, A321s)
You get no benefit for sticking with the same engine manufacturer
You get no benefit for sticking with the same engine series (appreciable at least, if there is one it's tiny and indiscernable)
You get no benefit for sticking with the same engine sub-type.  
« Last Edit: May 16, 2010, 08:49:52 PM by Sigma »

auerbacs

  • Former member
Re: Fleet Commonality
« Reply #9 on: May 16, 2010, 11:23:27 PM »
Hmm... what about the Tupolevs?

Tu-204, Tu-204-100, Tu-204-120, Tu-204-200... etc. Are these all unique sub-types for commonality purposes?

Offline swiftus27

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Re: Fleet Commonality
« Reply #10 on: May 16, 2010, 11:24:55 PM »
There is a difference between the JT8 and the JT9... my one 727 costs me an extra ~90k per month

Offline swiftus27

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Re: Fleet Commonality
« Reply #11 on: May 16, 2010, 11:27:15 PM »
Hmm... what about the Tupolevs?

Tu-204, Tu-204-100, Tu-204-120, Tu-204-200... etc. Are these all unique sub-types for commonality purposes?

as long as they use the same engine

Offline malucry

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Re: Fleet Commonality
« Reply #12 on: March 10, 2017, 07:29:35 PM »
Are Rolls-Royce Trent (500, 700, 800, 900, 1000, XWB, 7000) in the gsame family (type) in the game, I mean are cost of fixed maintenance common? If not, please fix this list of types :)

 

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