During the pre-flight mass and balance calculations, a fuel amount of 1850 kg has been decided to be carried for tankering purposes. While the refuelling procedure was about to start, the load controller informs the Commander about a Last Minute Change (LMC) of +285 kg. Given the following information, calculate the maximum Block Fuel that can be carried.
Dry Operating Mass: 4135 kg
Traffic Load before LMC: 1200 kg
Maximum Zero Fuel Mass: 6805 kg
Allowed Take-off Mass: 7205 kg
Minimum Required Block Fuel: 1430 kg
Taxi Fuel: 33 kg
(Assume no restrictions on the Landing Mass)
The only limiting factor is the Allowed Take-off Mass, 7205 kg, because we are looking for the max Block fuel. The Maximum Zero Fuel Mass does not assume any fuel amount.
So, the Max Additional fuel that can be carried is:
- Allowed TOM - DOM - TL before LMC - LMC - T/O fuel (Block - Taxi fuel) = 7205 kg - 4135 kg - 1200 kg - 285 kg - (1430 kg - 33 kg) = 188 kg.
Thus, the Maximum Block Fuel that can be carried is:
- Minimum Required Block Fuel + Max additional fuel = 1430 kg + 188 kg = 1618 kg, which means that the initially desired block fuel of 1850 kg cannot be carried after the LMC.
OR
The Max Allowable Take-off fuel that can be carried is:
- Allowed TOM - DOM - TL before LMC - LMC = 7205 kg - 4135 kg - 1200 kg - 285 kg = 1585 kg.
Thus, the Maximum Block Fuel that can be carried is:
- Max Allowable Take-off fuel + Taxi fuel = 1585 kg + 33 kg = 1618 kg.
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