ATR 72-600 (Hydraulics)

An amber HYD AUX OVHT message indicates:

• Overheat of the fluid in the blue auxiliary hydraulic pump return line

• Overheat of the fluid in the blue reservoir

• Overheat of the blue auxiliary hydraulic pump

The DC auxiliary Pump will start operating...

• If the blue main pump output pressure dropped below 1,800 psi

• If the blue main pump output pressure dropped below 2,100 psi

• If the blue main pump output pressure dropped below 1,500 psi

The HYD AUX PUMP pedestal pushbutton works on the ground with the battery switch OFF.

• True

• False

Each hydraulic system is mainly pressurized by means of:

• An ACW electrical pump

• An engine-driven pump

• An alternate pump

The components supplied by the blue hydraulic system include:

• Nose wheel steering, flaps, spoilers, propeller brake for the right engine, emergency and parking brakes

• Nose wheel steering, flaps, spoilers, propeller brake

• Flaps, spoilers, propeller brake, emergency and parking brakes

• Landing gear, emergency and parking brake

The components supplied by the green hydraulic system include:

• Nose wheel steering, landing gear, and normal brake

• Landing gear, normal brake, and parking brake

• Parking brake

• Landing gear and normal brakes

Where is the sensor for the OVHT light?

• On the pump drain cases

• In the supply lines feeding each pump

• In the reservoir

• On the return line

What is the normal main hydraulic pump output pressure for the blue hydraulic system?

• 1,500 psi

• 2,200 psi

• 3,000 psi

• 800 psi

The hydraulic fluid is contained in:

• A single common unpressurized tank, located in the hydraulic bay (left landing gear fairing)

• Two separate tanks (blue in the left landing gear fairing, green in the right landing gear fairing)

• A single common pressurized tank, located in the hydraulic bay (right landing gear fairing)

The auxiliary hydraulic pump runs automatically when blue system pressure drops below _______, the propeller brake is released, the gear handle is down, and at least one engine is running.

• 3,000 psi

• 1,500 psi

• 800 psi