How are the main generators cooled?

How are the main generators cooled?

• A. Coolant from the engine cooling system
• B. Air cooling via front-mounted radiators
• C. Oil from the main transmission
• D. Hydraulic fluid circulated through the gearbox

Answer: (C)

The main generators are cooled by the oil that lubricates the main transmission. They’re mounted on the transmission/Accessory Gearbox and sit in or directly in contact with the transmission oil. As the generator runs, heat is carried away by that oil, which is circulated through the gearbox and cooled by the transmission oil cooler. This uses the existing lubrication loop rather than a separate cooling system, making it the simplest and most effective method for the generators’ heat rejection. Other cooling methods (engine coolant, front radiator air cooling, or hydraulic fluid cooling) aren’t used for the main generators in this helicopter design.

The main generators are cooled by the oil that lubricates the main transmission. They’re mounted on the transmission/Accessory Gearbox and sit in or directly in contact with the transmission oil. As the generator runs, heat is carried away by that oil, which is circulated through the gearbox and cooled by the transmission oil cooler. This uses the existing lubrication loop rather than a separate cooling system, making it the simplest and most effective method for the generators’ heat rejection. Other cooling methods (engine coolant, front radiator air cooling, or hydraulic fluid cooling) aren’t used for the main generators in this helicopter design.