Hydraulics

Question 1

The purpose of the PTU is to provide Hydraulic System B fluid at a flow rate (approximately 6.5 GPM) and pressure sufficient to provide normal rates of operations for the _______ and _______ in the event the Hydraulic System B Engine-Driven Pump output pressure drops below a specific value.

Answer 1

Autoslats and Leading Edge Devices

Question 2

When is the automatic operation for Standby Hydraulic System initiated?

Answer 2

• Flaps extended, and
• airborne, or wheel speed greater than 60 kts, and
• loss of System A or B, with the respective FLT CONTROL switch positioned to ON

OR:

• the main PCU force Fight Monitor (FFM) trips

Question 3

What pressurizes both System A and System B hydraulic reservoirs?

Answer 3

Bleed Air

Question 4

When do the letters RF (white) appear? And when is it valid?

Answer 4

When the hydraulic quantity is below 76%. Valid only when aircraft is on the ground with both engines shut down or after landing with flaps up during taxi-in.

Question 5

How do you display the Hydraulics in the MAX?

Answer 5

MFD SYS Button.