ATA 67 - FLIGHT CONTROLS

Question 1

If one hydraulic system is lost, what is the effect on the displacement force?

Answer 1

It’s reduced by 50%, giving a noticable change to the pilot.

Question 2

How many Hydraulic systems are on the H145?

Answer 2

2

Question 3

Where is the hydraulic unit located?

Answer 3

On the upper deck.

Question 4

How many control rods are connected to the mixing lever?

Answer 4

3. Collective, lateral, longditudinal

Question 5

What is the purpose of the mixing lever?

Answer 5

to transfer signals from the control rods to the swashplate

Question 6

What is responsible for moving the actuator boost piston?

Answer 6

The spool valve

Question 7

What connects the swashplate gimbal to the control ring?

Answer 7

Two bearings

Question 8

Who is responsible for adjusting the collective friction?

Answer 8

The engineer

Question 9

How is the parallel actuator magnetic clutch powered?

Answer 9

Electrically. It opens when energised

Question 10

What happens when the electromagnetic clutch is energised in the parallel actuator?

Answer 10

It causes a seperation of the primary gear to the secondary gear

Question 11

What is the parallel DC motor conected to?

Answer 11

The primary reducer, before the clutch.

Question 12

What is the PAO damper?

Answer 12

PILOT ASSISTED OSCILLATIONS damper

Question 13

What is the purpose of the PAO damper?

Answer 13

It dampens unintended control inputs of the pilot due to possible oscillating ground resonance behaviors.

Question 14

If the pilot was to feel oscillations in the controls, what would need inspected?

Answer 14

The PAO damper.

Question 15

What position would the spool valve be in for both lines to be closed?

Answer 15

Neutral position.

Question 16

Where are the collective control signals sent to?

Answer 16

the sliding sleeve of the swashplate assembly.

Question 17

Where is the range stop for the cellective controls?

Answer 17

by a mechanical stop inside the hydraulic actuator.

Question 18

If an actuator jams, what happenes when the pilot moves the controls?

Answer 18

more force is needed which then moves the spool sleeve and creates a bypass.

Question 19

What is the purpose of the collective weight compensation?

Answer 19

it creates a force in the direction of “collective down”

Question 20

What is installed incase of a mechanical blockage of the LVDT’s?

Answer 20

Shear pins are installed

Question 21

What controls the DC motors of the parallel actuators?

Answer 21

the Electrical Unit Box

Question 22

What is the flight control module frame made of?

Answer 22

milled aluminium

Question 23

What is the displacement force of a main rotor actuator?

Answer 23

3150N

Question 24

Which line is the maintenance port on?

Answer 24

Low Px line

Question 25

What is the purpose of the check valve in the hydraluic actuators?

Answer 25

to block a reverse flow if the main rotor forces exeed the actuator forces.

Question 26

What is the test button for?

Answer 26

verfication of free movement of the spool sleeve.

Question 27

Facing FWD, which cyclic control lever is on the left?

Answer 27

lateral control.

Question 28

Where is the flexball routed for the Yaw?

Answer 28

along the r/h side channel, up the inclined frame and then to the left upper side of the tail boom.