View Full Version : B744 takeoff weights, ex DUB
akerosid
4th Jul 2005, 17:16
I wonder if any B744 pilots (particularly SQ Cargo) would have MTOW figures ex DUB.
I have an FAR table for various models of the 744, but they show an MTOW of around 365t. I don't think this can be right, but I wanted to check these against actual airline performance tables.
If you can show data for different temperatures (say 10/20 degrees C), that would be great.
How much is it worth??? :):):)
Mutt
akerosid
5th Jul 2005, 11:16
I wish I could put a figure on it! I know I've asked this before (and thanks for giving me the data on the 777!), but the problem is that I'm trying to put some hard data together to prove a case for extending the runway by about 1500' or so.
I guess you could say it's worth however much 1500' of concrete costs!
Unfortunately, there doesn't seem to be the slightest interest at official level in Ireland - either DAA or Department of Transport - in doing this. I fear we'll have to resign ourselves to an 8,650' runway until at least 2012, but I want to do what I can to make the case anyway.
Had someone run them but he forgot to bring them home. :(
Mutt
akerosid
5th Jul 2005, 17:41
No worries, it's not urgent. Whenever you can do it is fine - and thanks again for your help. ;)
B747-400 CF6-BF Engines.
RWY10
OAT/CLIMB/FIELD LIMITS
10°/4767/3876
20°/4767/3818
30°/4750/3759
RWY28
OAT/CLIMB/FIELD LIMITS
10°/4767/3800
20°/4767/3747
30°/4750/3689
Max Structural 394,625kgs
Mutt
akerosid
11th Jul 2005, 17:39
Thanks very much; I hope you won't mind my asking for clarification.
What does the middle figure mean (the climb)? Also, I thought at first glance that the last figure was the runway length required for an MTOW departure, but why would they bother showing this if the runway length is 2,650m anyway.
Please forgive the stupid question, but clearly I'm not well up on airplane manuals!
The standard Boeing output shows the CLIMB limit weight, this is the limiting weight for the temperature and pressure altitude where the aircraft can meet the certified climb gradients.
The FIELD limit weight is for the individual runway, it accounts for the acceleration/stop/go, obstacles, brake energy, tire speed and approach climb.
These two weights are compared to the certified structural weight, the lower value is the most limiting.
Example for RWY 10 @ 30°
Climb = 475,000 kgs
Field = 375,900 kgs
Struct = 394, 625 kgs
The field limit weight is the most limiting.
Mutt
freightmover
13th Jul 2005, 15:42
SQ Cargo aircraft has a MTOW of 394,625
We mosty come out from DUB about 270 tonnes. The aircrafts are normally heading towards CPH with min fuel in tanks. 30 tonnes
William A Bong
20th Jul 2005, 13:15
Just as a slight aside, we (GSS) operate the -400F with the GE CF6-80C2B5F Engines and have a Max taxi weight of 397800 Kgs and a max take off weight of 396893 Kgs.