Lesson 7: Switches, Seals, and Components Flashcards
What the 4 types of Hydraulic switches?
Pressure
thermal
position
limit
What is the purpose of a pressure switch?
close circuit for caution light
enable/disable backup pump operation
What are the types of pressure switches?
Piston
Diaphragm
Differential Pressure
How does a piston type switch work?
hydraulic pressure forces a piston against a spring to open micro switch
How does a diaphragm switch work?
similar to piston type but uses a diaphragm
This type of switch uses a integral diaphragm to compare 2 different sources which will result in a CLOSED micro switch
Differential pressure switch
What does a pressure transmitter do?
indicates pressure to the flight deck
What is the purpose of a thermal switch?
enable/disable pump operation
caution light when temp exceeded
temp indication
Purpose of a position switch
provides position on an actuator or flight control
What are the types of POSITION switches?
Micro switch rotary potentiometer lvdt/rvdt proximity sensor
All flight control indications originate from what?
Position switches
Purpose of limit switches?
stops an actuator at the LIMIT of its movement
Autopilot
horizontal stab
flap/slat
use what switch?
LIMIT
This component smooths out pulsations in the flow
Damper
What are the 2 types of dampers?
piston and vane