The following data applies to a helicopter, which is about to take off:
Certified Maximum Take-off Mass: 14 500 kg
Performance Limited Take-off Mass : 13 300 kg
Dry Operating Mass : 4 400 kg
Crew and crew hand baggage mass : 640 kg
Crew baggage in hold : 110 kg
Take-off fuel: 4 700 kg
From this data calculate the maximum allowable traffic load.
Refer to figures.
Dry Operating Mass (DOM) is the sum of the Basic Empty Mass (BEM) and the Variable Load (crew, crew baggage, food, beverages, water etc.), excluding both usable fuel and payload.
Traffic Load (TL) is the total mass of passengers, baggage, cargo (or freight), including any non-revenue load. Traffic Load plus Dry Operating Mass (DOM) is equal to the aircraft's Zero Fuel Mass (ZFM).
The most limiting factor is the Performance limited take-off mass, because it is lower than the Certified Maximum Take-off Mass (structural limit).
Thus, for this question only the Performance limited TOM will be taken into account.
To determine the maximum allowable traffic load, subtract from the most take-off limiting factor, the DOM and the take-off fuel:
- Max allowable Traffic Load = PL TOM - DOM - T/O Fuel = 13 300 kg - 4 400 kg - 4 700 kg = 4 200 kg
NOTE:
The question asks for the maximum allowable traffic load and NOT the maximum additional traffic load.
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