Chapter 6 - Hydraulic System

Question 1

How many hydraulic systems are there?

Answer 1

3

Question 2

What are the 3 hydraulic systems used for?

Answer 2

No. 1 & No.2 - Flying Controls

No.3 - Everything else

Question 3

What does the No.3 Hydraulic system provide hydraulics for? (8)

Answer 3

Rescue Hoist
Rotor Brake
Main + Nose Landing gear
ACSR
Nose Wheel Steering
Parking Brakes
Ramp
Main Brakes

Question 4

What does IHPS stand for?

Answer 4

Integrated Hydraulics Power Supply

Question 5

What major components does the IHPS store?

Answer 5

Reservoir
Pressure & Temperature Sensors
HP Hydraulics Pump
Heat Exchanger
Filters
Magnetic Plugs & Chip Detectors

Question 6

What does the CSOV do?

Answer 6

Allows for No.3 hydraulics system pressure to be directed to the No.1 & No.2 system in the event of a failure

Question 7

What is the Auxiliary Reservoir used for?

Answer 7

For additional hydraulic fluid storage, enough to charge the emergency accumulator and aid in the services of the No.3 system

Question 8

What is the Auxiliary Pump used for?

Answer 8

Used for when No.3 IHPS is not operating, draws hydraulic fluid from the reservoir and supplies it to the No.3 system services

Question 9

What type of pump is the Auxiliary Pump?

Answer 9

Electric driven hydraulic pump

Question 10

What does the hydraulic manifold do?

Answer 10

Controls the hydraulic pressure to the rotor brake system and to the emergency accumulator

Directs the hydraulic fluid to different services

Question 11

What is the emergency accumulator?

Answer 11

Provides a store of hydraulic pressure

Question 12

What is the emergency accumulator used for?

Answer 12

Emergency Blow down
OR
20 applications to the parking brake system

Question 13

Are the IHPS’s rinterchangable?

Answer 13

Yes

Question 14

What is the No.1 IHPS attached to?

Answer 14

MRGB

Question 15

What is the No.2 and No.3 IHPS attached to?

Answer 15

AGB

Question 16

What are the IHPS & Auxiliary reservoir protected with?

Answer 16

Removable silver silicon blanket

Question 17

What are the 4 level switches for IHPS?

Answer 17

Full
Refill
Alert
Low

Question 18

What does the IHPS level test button carry out a test on?

Answer 18

MIN and Low-level switches only

Question 19

What are the functions of the pressure relief and bleed valves?

Answer 19

Operate automatically in normal conditions and relieve hydraulic pressure in the reservoir

Prevent reservoir from being damaged due to excessive pressure

Provide a means of bleeding hydraulic fluid from the reservoir during maintenance

Question 20

What does the blocking valve do?

Answer 20

Prevents hydraulic fluid from leaving the IHPS as the IHPS pump cannot be switched off

Question 21

How is the blocking valve operated?

Answer 21

From the cockpit via the Hydraulics control panel

Question 22

When filling the No.3 IHPS, what sight glass must you take the reading FULL from?

Answer 22

Auxiliary Reservoir

Question 23

What is the Tail Shut Off Valve?

Answer 23

In the event of a major leak in the tail rotor servo actuator hydraulic supply lines, No.2 IHPS TSOV prevents a loss of hydraulic fluid from the No.2 IHPS

Question 24

What are ripple eliminators?

Answer 24

Components in the rear fuselage that ensure smooth transmission of hydraulic fluid by dampening out fluctuations to the tail servo

Question 25

What must be done to ensure the return of hydraulic fluid to ground servicing equipment during maintenance?

Answer 25

Quick release coupling must be disconnected on the IHPS

Question 26

What action must be taken before carrying out maintenance/functionals on a hydraulic system?

Answer 26

Ensure pressure has been dissipated via the release valve on the emergency accumulator