A flight crew of a twin engine helicopter prepares a Commercial Flight using the following information. Determine the allowed take-off mass for this flight:
Maximum Take-Off Mass: 22 800 kg
Maximum Landing Mass: 21 900 kg
Maximum Zero Fuel Mass: 18 300 kg
Performance-Limited Landing Mass at destination: 20 950 kg
Block Fuel: 4 720 kg
Taxi Fuel: 20 kg
Trip Fuel: 3 960 kg
Reserve Fuel (contingency, alternate and final): 660 kg
Take-off Mass is NOT performance limited
To determine the allowed take-off mass, we will consider MTOM, MZFM (MZFM + Take-off Fuel) and MLM (MLM + Trip Fuel) and choose the most limiting figure:
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Maximum Take-off Mass: 22 800 kg
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Maximum Zero Fuel Mass (MZFM + Take-off Fuel): 18 300 kg + 4 720 kg - 20 kg = 23 000 kg
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Maximum Landing Mass (MLM + Trip Fuel): 21 900 kg + 3 960 kg = 25 860 kg (use the lower of the two landing masses given)
Thus, the allowed mass for take-off is the lowest one: 22 800 kg
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