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MEL Vs CDL  
User currently offlineKimon From , joined Dec 1969, posts, RR:
Posted (4 years 7 months 3 days 15 hours ago) and read 13126 times:

What is the difference?
Many thanks!

8 replies: All unread, jump to last
 
User currently offlineDw747400 From United States of America, joined Aug 2001, 1259 posts, RR: 1
Reply 1, posted (4 years 7 months 3 days 14 hours ago) and read 13105 times:

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?



CFI--Certfied Freakin Idiot
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 2, posted (4 years 7 months 3 days 13 hours ago) and read 13096 times:



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.


User currently offlineDw747400 From United States of America, joined Aug 2001, 1259 posts, RR: 1
Reply 3, posted (4 years 7 months 3 days 12 hours ago) and read 13063 times:



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....



CFI--Certfied Freakin Idiot
User currently offlineJetMech From Australia, joined Mar 2006, 2690 posts, RR: 53
Reply 4, posted (4 years 7 months 3 days 10 hours ago) and read 13052 times:



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.

Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 5, posted (4 years 7 months 3 days 9 hours ago) and read 13030 times:



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.


User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 6, posted (4 years 7 months 3 days 4 hours ago) and read 12971 times:

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.



Think of the brighter side!
User currently offlineBabaero From Philippines, joined Jan 2002, 464 posts, RR: 0
Reply 7, posted (4 years 7 months 1 day 8 hours ago) and read 12776 times:

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


User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 8, posted (4 years 7 months 1 day 5 hours ago) and read 12751 times:



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.



Think of the brighter side!
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