Lesson 7: Switches, Seals, and Components Flashcards

1
Q

What the 4 types of Hydraulic switches?

A

Pressure
thermal
position
limit

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2
Q

What is the purpose of a pressure switch?

A

close circuit for caution light

enable/disable backup pump operation

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3
Q

What are the types of pressure switches?

A

Piston
Diaphragm
Differential Pressure

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4
Q

How does a piston type switch work?

A

hydraulic pressure forces a piston against a spring to open micro switch

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5
Q

How does a diaphragm switch work?

A

similar to piston type but uses a diaphragm

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6
Q

This type of switch uses a integral diaphragm to compare 2 different sources which will result in a CLOSED micro switch

A

Differential pressure switch

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7
Q

What does a pressure transmitter do?

A

indicates pressure to the flight deck

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8
Q

What is the purpose of a thermal switch?

A

enable/disable pump operation
caution light when temp exceeded
temp indication

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9
Q

Purpose of a position switch

A

provides position on an actuator or flight control

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10
Q

What are the types of POSITION switches?

A
Micro switch
rotary
potentiometer
lvdt/rvdt
proximity sensor
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11
Q

All flight control indications originate from what?

A

Position switches

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12
Q

Purpose of limit switches?

A

stops an actuator at the LIMIT of its movement

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13
Q

Autopilot
horizontal stab
flap/slat
use what switch?

A

LIMIT

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14
Q

This component smooths out pulsations in the flow

A

Damper

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15
Q

What are the 2 types of dampers?

A

piston and vane

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16
Q

Piston dampers are used on what

A

flight controls

17
Q

This component is commonly used to cool hydraulic fluid and case drain fluid

A

heat excahnger

18
Q

Purpose of hydraulic seals?

A

minimize leakage and loss of pressure
reduce wear
prevent contamination

19
Q

2 types of seals?

A

Packing and gasket

20
Q

This type of seal is used for when a lot of movement exists

A

packing

21
Q

this type of seal is used when no movement exists

A

gasket

22
Q

what side of the shape is on the high pressure side?

A

inside of shape

23
Q

What is the most common seal used on the aircraft?

A

O Rings

24
Q

What does the colour code of the o ring identify?

A

fluid type

25
Q

When do we use Back up rings?

A

when system pressure is greater than 1500 psi

26
Q

2 types of back up rings?

A

Leather and teflon

27
Q

MOst effective way to know youre using the right o ring?

A

Part Number

28
Q

you mus always lubricate the o ring with?

A

the fluid being used

29
Q

What are the types of hydraulic back up supply sources?

A
EMP
Hydraulic Motor (PTU/PDU)
ATM
RAT
Accumulator/air bottle
30
Q

Purpose of Electric Motor Pump?

A

electricity to drive hydraulic pump
ac/dc
primary pump on small airc
backup for large

31
Q

Purpose of Hydraulic motor?

A

hydraulic system pressure used to operate hydraulic motor = turn drive shaft

32
Q

This component one system is used to pressurize another system, without a transfer of fluid,

A

PTU

33
Q

What are PDUs used for?

A

flap/slat
horizontal stab
drive train

34
Q

Purpose of air turbine motor?`

A

drive hydraulic pump using pneumatic system

35
Q

This backup is your last hope

A

the RAT

36
Q

this backup is used for brakes

A

accumulator/ air bottle