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A330/340 Fuel/Balance/Performance Calculations  
User currently offlinetom355uk From United Kingdom, joined Nov 2007, 336 posts, RR: 3
Posted (4 years 9 months 3 weeks 6 days 9 hours ago) and read 8718 times:

A plea from one Aviation Fan to many:

I know this is probably a massive long shot and I have searched sitewide but could find nothing on the subject.

I need the relevant pages from the A332/3 or A345/6 FCOM (any engine variation) with fuel calculations, CofG and balance calculations and performance graphs (TO/Climb/Cruise/Descent/Approach) for the different weights. I know there are no hard and fast rules due to the many variables involved, but even 2 pairs of fixed numbers on all or most of the mentioned parameters so the inbetween bits can be approximated!

Any information that can be provided is gladly welcomed. If you have copies of these pages you could scan and email me, that would be awesome  

Here's hoping.....I know if anyone can do it you guys can!

Tom.


on Twitter @tombeckett2285
7 replies: All unread, jump to last
 
User currently offlinemandala499 From Indonesia, joined Aug 2001, 6965 posts, RR: 76
Reply 1, posted (4 years 9 months 3 weeks 6 days 6 hours ago) and read 8686 times:

Quoting tom355uk (Thread starter):
I need the relevant pages from the A332/3 or A345/6 FCOM (any engine variation) with fuel calculations, CofG and balance calculations and performance graphs (TO/Climb/Cruise/Descent/Approach) for the different weights. I know there are no hard and fast rules due to the many variables involved, but even 2 pairs of fixed numbers on all or most of the mentioned parameters so the inbetween bits can be approximated!

Do you have an FCOM 2 for the aircraft of interest?

CoG Balance calculations are in 2.01.40.
It has a sample page of the Load and Trim Sheet. But, the trim numbers are ommitted in the samples. The only rules are not to exceed the CoG envelope for take off, and, as the fuel decreases, make sure it doesn't make the CoG exceed it's aft limits.

2.02 covers the take off... but there's a lot to cover on this one so what is it that you're looking for? If you want just the field limit take off weights, it has it in 2.02.30 "Quick Reference Tables"... for various lengths, temperature and altitude... plus what the limitations are (1st segment, 2nd segment climb, runway length, tire speed, brake energy, max weight, final take off speed, or VMU).

2.03.10 covers the landing distances...

2.04 covers special operations.

2.05 is for flight planning... I guess this is what you're looking for.

2.05.20 is to find out the optimum and maximum altitudes, including for short stages.

2.05.30 covers integrated cruise (fuel required to cover a certain distance) has it on ISA conditions (there are ISA deviation fuel correction calculations covered in 2.05.40

2.05.40 covers quick determination of flight plan... gives the time required to take off from A and land at B for landing at B at a reference weight... for certain speeds... the tables give the cruise altitudes. There are correction values available for reference weight differences, pack flow, and anti-ice on or off...

2.05.50 gives the alternate calculations (which provides part of the reference landing weight corrections required for 2.05.40.

2.05.60 gives the ground to air miles conversion due to wind influence.

---
So, there is little benefit in giving copies of the relevant pages unless it's clearer on what you are actually looking for... Perhaps a search on FCOM 2 on google might yield the whole document.

Mandala499



When losing situational awareness, pray Cumulus Granitus isn't nearby !
User currently offlinetom355uk From United Kingdom, joined Nov 2007, 336 posts, RR: 3
Reply 2, posted (4 years 9 months 3 weeks 1 day 17 hours ago) and read 8486 times:

Thanks mandala499,

I did manage to locate an A332 FCOM I/II/II/IV online, I found all the information I need there.

Your chapter specific pointers were extremely helpful - although my brain hurt a little while trying to construct some rudimentary Excel calculations  

Cheers mate!



on Twitter @tombeckett2285
User currently offlinemandala499 From Indonesia, joined Aug 2001, 6965 posts, RR: 76
Reply 3, posted (4 years 9 months 3 weeks 1 day 17 hours ago) and read 8484 times:

Quoting tom355uk (Reply 2):
Your chapter specific pointers were extremely helpful - although my brain hurt a little while trying to construct some rudimentary Excel calculations

That's typical Airbus for you... when first reading their documents, one would feel the brain wants to explode... but it's very convertible to "rudimentary excel calculations"...

Landing weight at alternate + alternate fuel + alternate fuel adjustment + holding fuel = Landing weight at destination.
Get the trip fuel required based on the landing weight at destination + landing weight adjustment = trip fuel.
Slap on a 3 - 5% fuel reserve on the trip fuel (depending on the regulatory environment you're in).

Add the landing weight and trip fuel and reserves you get the take off weight. Look at the take off tables and see if you can go airborne or not...

Simple... but yes, got my brain fried for a while!   



When losing situational awareness, pray Cumulus Granitus isn't nearby !
User currently offlinetom355uk From United Kingdom, joined Nov 2007, 336 posts, RR: 3
Reply 4, posted (4 years 9 months 3 weeks 1 day 9 hours ago) and read 8392 times:

I've managed to go slightly better than that!

I've produced a comprehensive Takeoff and Performance calculator to provide Maximum Permissible TOW's for various runway lengths, windspeeds, AD elevations and OAT's. It calculates trip and total fuel required based on CRZ FL, payload and TOW, (albeit at a fixed speed and without CRZ wind adjustments - yet   ), and also a V speed calculator based on OAT and BRW.

Some of the calculations are approximated, and are quite generous but offer enough detail for me to produce half decent flightplans for simulation use  

The FCOM's are absolutely fascinating though, so many systems that you never hear or read about but are absolutely ingenious!

God I wish I was a real pilot! Maybe if I can find a job as a dispatcher instead, seeing as I wont ever have the money to pay for my ATPL (unless I win the Lottery    )



on Twitter @tombeckett2285
User currently offlinemandala499 From Indonesia, joined Aug 2001, 6965 posts, RR: 76
Reply 5, posted (4 years 9 months 3 weeks 1 day 6 hours ago) and read 8371 times:

Quoting tom355uk (Reply 4):
I've produced a comprehensive Takeoff and Performance calculator to provide Maximum Permissible TOW's for various runway lengths, windspeeds, AD elevations and OAT's. It calculates trip and total fuel required based on CRZ FL, payload and TOW, (albeit at a fixed speed and without CRZ wind adjustments - yet   ), and also a V speed calculator based on OAT and BRW.

Send me a copy and I'll put it through its paces see how it can withstand the abuse of Ops Con...   
Some of us can do it faster than the flight planning and performance software on slow net access...   

Nah, up to you... but less of stuff like this:

Quoting tom355uk (Reply 20):
The 747 is miles away from the A340-600 on CASM, trip cost and cargo volume, so in real terms we should be waving bye bye to the 744 before the A346....

Wouldn't hurt a.net either...   



When losing situational awareness, pray Cumulus Granitus isn't nearby !
User currently offlinetom355uk From United Kingdom, joined Nov 2007, 336 posts, RR: 3
Reply 6, posted (4 years 9 months 3 weeks 14 hours ago) and read 8319 times:

Hey, c'mon! Facts is facts 

and somebody has to defend the A340!!!

We'll agree to disagree though, yes?

I can send it you if you like, it is very rough though.

I think it was a FCOM from one of the earlier birds (due to the figures and the MSN at the bottom of the page   ), but it seems good enough for my liking, and the figures seem to go in the right direction dependent on what I enter! Any feedback is gladly appreciated though, as I'm always willing to learn from people who know more than me.

PM me your email and i'll send it across if you want.



on Twitter @tombeckett2285
User currently offlinemandala499 From Indonesia, joined Aug 2001, 6965 posts, RR: 76
Reply 7, posted (4 years 9 months 3 weeks 9 hours ago) and read 8268 times:

Quoting tom355uk (Reply 6):
Hey, c'mon! Facts is facts

"Facts" = a lacking commodity outside techops here   

Quoting tom355uk (Reply 6):
We'll agree to disagree though, yes?

I'm not sure/can't even remember if we agree or disagree to be honest....

Quoting tom355uk (Reply 6):
I can send it you if you like, it is very rough though.

Standby1... I'll be visiting one of the airline flightops offices here sometime this weekend for some reviews... I'll see if those guys can put it through its paces and give feedback...

Mandala499



When losing situational awareness, pray Cumulus Granitus isn't nearby !
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