Mass & Balance questions
Can anyone help me here? Am I missing something? I have no clue how the answers of these questions were arrived at (source - OAT exam prep CD-ROM)
1) Using the data for the aircraft below, assuming that the traffic load to be carried is as shown, what will be the block fuel for take off at MTOM? Crew & equipment - 280kg MTOM - 12154kg MZFM - 3227kg BEM - 1457kg Start/taxi fuel - 250kg Trip fuel - 8450kg Flight duration - 3 hours Pax - 720kg Baggage - 4435kg a) 7677kg b) 8972kg c) 9512kg d) 9262kg answer given = c) 2) A cuboid box of dimensions 0.8m x 0.8m is to be placed into an aircraft hold with a maximum distribution load intensity of 5000N/sqm. What is the max. mass that can be loaded in the box? (assume that acceleration due to gravity is 10m/sec sq. a) 800kg b) 40kg c) 400kg d) 80kg answer given = d For this one I would have thought it was a simple question of ratios, ie. MDLI= 500kg/sqm therefore 500/1 = x/(0.8 x 0.8) therefore x = 320kg, not given here.... where am i going wrong? Cheers, FT |
Tiger :
I think you are looking at 2 misprints here - Question 1 : Baggage = 435kg : gives correct answer Question 2 : Box must have dimensions of 0.4x0.4x0.4 Your reasoning for #2 is correct, if you need an explanation for #1 then let me know |
Thanks, Greaser...
That was my keying error on #1, still don't quite get it. Could you work through it please? Cheers, FT |
No probs tiger :
Takeoff is to be at MTOM = 12154 kg Start/Taxi fuel = 250kg so ramp mass = 12404 kg ----------------------------------------------------------------------- BEM = 1457 kg Crew/equipment = 280kg so dry operating mass = 1737kg (may also be called APS) traffic load = 1155 kg (pax + baggage) so zero fuel mass = 2892kg ------------------------------------------------------------------------ Block (ramp fuel) = ramp mass - zero fuel mass = 12404 - 2892 = 9512 kg |
"therefore 500/1 = x/(0.8 x 0.8) "
therefore x = (500*0.16)/1 and x = 80kg |
0.4 x 0.4 = 0.16
0.8 x 0.8 = 0.64 |
Doh! - didn't have my maths head on. I agree about the typo, the area should come out at 0.16 square metres.
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Thanks guys. Alex, see you end of October for Mod 1 brush-up!
FT |
Well I probably wouldnt be able to answer these without Alex and his team, as I went through Bristol 3 years ago. Good luck FT.
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