smartt1982
Topic Author
Posts: 226
Joined: Sat Nov 24, 2007 11:17 pm

Max Take Off Weight

Mon Jun 11, 2012 8:53 pm

How do you find out the max take off weight of an airliner?

In our company FCOM Limitation section it lists the Max take weight as 74,990 (at the top of the paragraph it has our company identifier which means the info has been changed from the original Boeing master copy in some way.

Else where on this site it lists it as a high gross weight max take-off 79,015kg and on the Boeing site it is listed as 79,010 kg.

What are the reasons behind an airline choosing a lower Max weight, does it affect maintenance/charges for using the aircraft like a car tax?

In relation to this, when we press TOGA on a G/A the bug speed drives to a flap speed for the aircraft at the max take-off weight so if it gets all the way to flaps up before ALT ACQ the speed window will open at 222 knots, now will this be the up speed for the weight that Boeing has or the one the company has chosen? Would that sort of change affect the flight instrumentation software?
 
Viscount724
Posts: 18858
Joined: Thu Oct 12, 2006 7:32 pm

RE: Max Take Off Weight

Mon Jun 11, 2012 10:12 pm

Quoting smartt1982 (Thread starter):
What are the reasons behind an airline choosing a lower Max weight, does it affect maintenance/charges for using the aircraft like a car tax?

It affects landing fees for one thing, as in most of the world landing fees are based on MTOW. In the U.S. it's maximum landing weight I believe.

In some countries various other air navigation charges and overflight fees etc. also sometimes use MTOW as one of the factors in the charging formula.
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Max Take Off Weight

Mon Jun 11, 2012 10:13 pm

Quoting smartt1982 (Thread starter):
What are the reasons behind an airline choosing a lower Max weight, does it affect maintenance/charges for using the aircraft like a car tax?

Many airports charge landing feeds based on MTOW. If you don't need that weight (i.e. you never fly far enough to be that heavy) then you can save money by "derating" the MTOW.

Tom.
 
smartt1982
Topic Author
Posts: 226
Joined: Sat Nov 24, 2007 11:17 pm

RE: Max Take Off Weight

Tue Jun 12, 2012 8:49 pm

Cheers, so when we press TOGA and we go to speeds for Max take off, would that be the Boeing structural or our own company limit?

Also our numbers are depicted as 66990, 69,990 and 74,990, any particular reason for the 990 at the end?
 
Clydenairways
Posts: 1099
Joined: Thu Jan 11, 2007 8:27 am

RE: Max Take Off Weight

Wed Jun 13, 2012 11:53 am

Quoting smartt1982 (Reply 3):

Also our numbers are depicted as 66990, 69,990 and 74,990, any particular reason for the 990 at the end?

I would guess it is due to how the category bands for nav charges are set up. If you look at a JP fleets you will find a lot of aircraft with different European airlines ending in 990. This must be the cut-off point where 991 would put you in a higher charge category.

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