Mass & Balance questions
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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
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
Join Date: Mar 2002
Location: UK
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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
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
Join Date: Mar 2002
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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
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