Chapter 13: Hydraulics

Question 1

Explain the meaning of a hydraulic pump LOW PRESSURE indication.

Answer 1

Output pressure of the associated pump is low.

Question 2

Explain the meaning of a hydraulic OVERHEAT indication.

Answer 2

Hydraulic fluid used to cool and lubricate the corresponding electric motor driven pump has overheated or the pump itself has overheated.

Question 3

Identify where hydraulic fluid quantity is displayed and the associated indicator of low quantity.

Answer 3

Quantities for the A and B system are displayed on the lower DU by pushing the MFD System (SYS) Switch. A white refill indication (RF) beside the hydraulic quantity indication indicates low hydraulic quantity.

Low quantity in the Standby Hydraulic reservoir is indicated by the illuminated amber Standby Hydraulic
LOW QUANTITY light (always armed) on the Forward Overhead panel.

Question 4

Explain the function of the ENGINE HYDRAULIC PUMP Switches.

Answer 4

ON – de-energizes blocking valve in pump to allow pump pressure to enter the system.

OFF – energizes blocking valve to block pump output.

Note: Normally should remain ON at shutdown to prolong solenoid life.

Question 5

Recall the independent hydraulic systems and how they are designated.

Answer 5

Three independent systems designated:

• System A
• System B
• Standby system

Question 6

Explain the function of the ELECTRIC HYDRAULIC PUMP Switches.

Answer 6

ON – provides power to associated electric motor-driven pump.

OFF – electrical power removed from pump.