And to go along with the link to the photo of the A310 above (The system is essentially identical on the A310 and A300):
AAL A300-600R AMM 32-48-00-0
BRAKE COOLING - DESCRIPTION AND
This equipment is optional.
The equipment enables high speed cooling of the brakes and therefore a
reduction in the aircraft turn around time in the event of short flights with high energy braking.
2. Mechanical Installation
There is one fan per main gear wheel.
Each fan is comprised of : -
- a motor
- an impeller
- a shroud comprising a debris guard
The fan motor is housed in the wheel axle, held in position by means of an adaptor assy. The motor drives the impeller which creates a flow of air from the heat pack to the exterior through the debris guard. The tachometer drive shaft passes through the hollow fan motor shaft. The tachometer is driven by the shroud.
Responsibility for the fans lies with the brake manufacturer. (??????.....)
For both Messier and Bendix the fans are manufactured by Technofan. Only the fan shroud differs.
3. Electrical Installation
The fan motor is of the three-phase type. The two motors in each twin-wheel axle have a common supply. With the landing gear downlocked, the fans are started by pressing the illuminated pushbutton switch 30GW. The fans must be started as soon as the pushbutton switch HOT
legend comes on.
Illumination of the HOT
legend indicates that at least one brake has exceeded the brake overheat threshold.
"Eagles soar. But weasels never get sucked into jet intakes.."