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I’m currently doing a few practice exams in preparation for my perf exam and seem to have an issue with the following question:
With the passenger seats in rows 2 and 3 removed, an Echo has a basic empty weight and index units of 1950 kg and 467.5 adjusted accordingly. The pilot and co-pilot (@ 95 kg each) are employed to carry as many 4 kg boxes as possible. The cargo is sensitive and is only suitable for carriage in the passenger cabin and the rear compartment. If hard ballast is available in the form of 5 kg metal bars, the minimum amount of fuel as ballast required on this flight is closest to;
a) 67 kg.
b) 102 kg.
c) 59 kg.
d) 82 kg
I arrived at option A (it being the closest to my answer without exceeding it), but the answer given is C.
Here is my thought process:
I have 164kg in each of Row 2 & 3 (max weight that can be placed on the area otherwise occupied by a seat is 82kg; 2 seats in each row so 82x2) and 152kg in the rear compartment which gives me a ZFW of 2620kg. Hard ballast can only be 10kg before I hit max ZFW, so then following the fuel as ballast flow chart I arrive at 76kg.