Given Dry Operating Mass = 33000 kg + Traffic Load = 8110 kg + Final Reserve Fuel = 983 kg + Contingency Fuel 102 kg
= 42195
Explanation Provided by Fisnik Lluka
Explanation Provided by Stine Svensen
DOM (34900kg) + Total Traffic Load (11230kg) = 46130kg. Note there are two answers with this value.
You then need to enter the graph on the right at the Dry Operating Index of 33.5.
Before you do this, draw a horizontal line through 46,130kg.
Enter the graph and follow the arrows to scale with the information listed on the left hand side.
Once you exit the top element, draw a line into the chart and intercept your MZFM (46,130kg) and you should come out at just under 18%. There are two options, 17.8% and 20.8%.
The closest option therefore (accounting for some margin of error whilst drawing on the screen!!!) was 46,130kg and 17.8%
Explanation by Stuart Lemon
Explanation Provided by conall
The Maximum Zero Fuel Mass (MZFM):
1) is a regulatory limitation. Correct answer, as found in the Flight Manual.
2) is calculated for a maximum load factor of +3.5 g. Incorrect answer, CS25 requires a limit of +2.25g
3) is based on the maximum permissible bending moment at the wing root. Correct answer
4) is defined under the assumption that fuel is consumed from the outer wing tanks first. Incorrect, fuel is assumed to be consumed from the inner wing tanks first. This leaves the fuel in the outer wing tanks to have a greater wing bending relief.
5) is defined under the assumption that fuel is consumed from the inner wing tanks first. Correct answer.
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