kimon
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MEL Vs CDL

Fri Jan 29, 2010 10:37 pm

What is the difference?
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dw747400
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RE: MEL Vs CDL

Sat Jan 30, 2010 12:01 am

Short version is an MEL has to do with a system, such as an inoperative AC pac.

CDL (configuration deviation IIRC) has to do with equipment not be present, such as a missing winglet or missing flap track fairing.

I'm sure some of the experienced crews and dispatchers can add to that, and while we are on the topic... what are some of the more unusual things you've seen on MEL/CDLs?
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tdscanuck
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RE: MEL Vs CDL

Sat Jan 30, 2010 12:24 am



Quoting Dw747400 (Reply 1):
I'm sure some of the experienced crews and dispatchers can add to that, and while we are on the topic...

You basically nailed it. MEL is for inoperative things, CDL is for missing things.

Quoting Dw747400 (Reply 1):
what are some of the more unusual things you've seen on MEL/CDLs?

Well, a 737 can have the entire cabin pressure control system inoperative; I've actually done a flight under that one.

The 737-100/200 could also be missing the entire engine tail cone.

Tom.
 
dw747400
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RE: MEL Vs CDL

Sat Jan 30, 2010 2:05 am



Quoting Tdscanuck (Reply 2):
The 737-100/200 could also be missing the entire engine tail cone.

Pardon my ignorance, but where exactly is the tailcone on a JT8D?

http://upload.wikimedia.org/wikipedia/commons/5/55/Boeing_737-200_thrust_reverser.jpg

Quoting Dw747400 (Reply 1):
equipment not be present

Me eloquent. Need to proofread....
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jetmech
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RE: MEL Vs CDL

Sat Jan 30, 2010 3:16 am



Quoting Dw747400 (Reply 3):
but where exactly is the tailcone on a JT8D?

I'd say it is inside the jetpipe itself. You would probably have to look up inside the exhaust to see it.

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tdscanuck
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RE: MEL Vs CDL

Sat Jan 30, 2010 4:28 am



Quoting Dw747400 (Reply 3):
Pardon my ignorance, but where exactly is the tailcone on a JT8D?

JetMech is correct:

Quoting JetMech (Reply 4):
I'd say it is inside the jetpipe itself. You would probably have to look up inside the exhaust to see it.

It covers the back of the turbine case and provides an aerodynamic plug so the core flow can come together nicely. It's entirely inside the tailpipe/reverser structure.

Tom.
 
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HAWK21M
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RE: MEL Vs CDL

Sat Jan 30, 2010 9:45 am

MEL covers Inoperative items,where as CDL covers external items like panels etc.

Quoting Dw747400 (Reply 3):

Pardon my ignorance, but where exactly is the tailcone on a JT8D?

Just Fwd of the TR attachment.


regds
MEL.
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babaero
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RE: MEL Vs CDL

Mon Feb 01, 2010 5:48 am

I guess having a CDL which allows 744 pax version to dispatch with one missing winglet, but not allowed with two removed.

Strange when you consider 744D 743 and 742 operate with no winglets
 
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HAWK21M
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RE: MEL Vs CDL

Mon Feb 01, 2010 8:43 am



Quoting Babaero (Reply 7):
I guess having a CDL which allows 744 pax version to dispatch with one missing winglet, but not allowed with two removed.

Strange when you consider 744D 743 and 742 operate with no winglets

Thats because there are wing tips in place for reducing drag.Where as removed winglets will not have a faired surface.

regds
MEL.
I may not win often, but I damn well never lose!!! ;)

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