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A helicopter’s Take-Off Mass (TOM) is 8 600 kg including a usable fuel load of 1230 kg and a Traffic Load (TL) of 1 890 kg. What is the Dry Operating Mass (DOM) if the standard mass for the crew is 190 kg?

• A
6 710 kg
• B
5 290 kg
• C
8 410 kg
• D
5 480 kg

Refer to figures.
Dry Operating Mass (DOM) is the total mass of the helicopter ready for a specific type of operation excluding all usable fuel and traffic load. This mass includes the items below, known as Variable Load (VL):

• Crew and crew baggage
• Catering and removable passenger service equipment
• Portable water and lavatory chemicals
• Food and beverages

Take-Off Mass (TOM) is the mass of a helicopter including everything and everyone contained within it at the start of the take-off run.

Traffic load (TL) in a helicopter refers to the number of passengers or cargo that the aircraft is carrying at a given time. It is used to determine the weight and balance of the helicopter, which is important for safe flight. The maximum traffic load of a helicopter is determined by its design and is specified in its flight manual.

We can easily find out the DOM by referring to the figure attached, giving:

• DOM = TOM - TL- Usable fuel
• DOM = 8 600 kg - 1 890 kg - 1 230 kg
• DOM = 5 480 kg

NOTE:
For this type of questions, it’s advised to make a table with the different masses. Thus, giving a visual and simplified way of finding the mass in question.

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