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  1. - to inform maintenance personnel of potential problem. 

    + receives signals from various acft sys’s. 
    + If fault occurs, will trip direct indication.
    + functions like a caution panel.
    Avionics Status Panel (ASP)
  2. - the component that holds liquid coolant for the system. 

    + a line replaceable unit.
    + includes sub-components: reservoir, the fill/refill potentiometer, the piston, & the pump.
    Liquid Coolant System (LCS) Pump Assembly
  3. - used to store the liquid coolant & can contain up to 100 cubic inches of liquid coolant.
  4. - a wiper type unit, which provides a signal to the Avionics Status Panel, & turns ‘on’ the fill/refill light when the system loses 20 cubic inches or more of coolant.
    Fill/Refill Potentiometer
  5. - is designed to maintain constant pressure and flow throughout the system anytime the system is operating. 

    + is driven by a three-phase 115VAC motor. 
    + delivers 5.25 gallons of liquid coolant per minute 100 psi.
  6. - removes heat from the liquid coolant. 

    + located in the avionics cooling air ducting.
    + liquid-to-air type 
    + can be bypassed if the liquid is cool.
    Heat Exchanger
  7. - controls the temperature of the liquid coolant. 

    - will open or close depending upon the coolant.
    - temp of liquid determines whether it will bypass or flow to the heat exchanger.
    Thermal Pilot Valve
  8. - when open, provides a path of lesser resistance for coolant flow. 

    + when closed: the coolant must flow through the heat exchanger.
    + spring loaded poppet valve.
    Modulating Valve
  9. - are installed in the liquid coolant system to sense the temperature of the coolant. 

    + turns on warning light @ & sends signal to ASP. If the liquid is too hot to cool the radar unit 140 - 160 degrees F. 

    + 2 sensors are located bwtn. pilot valve & the low pressure sw the other btwn the filter delta sw & the pump.
    Over temperature Sensor
  10. - ill complete an electrical circuit and trip an ASP indicator. 

    + indicates that the pressure in the sys. is low. 
    + sends signals to ASP w/ low or no pressure.
    Low Pressure SW
  11. + Protects radar unit from high pressures 

    + spring loaded to the closed position. 

    + Liquid will flow to the ball of the bypass valve during sys. op. but spring will hold valve closed. 

    - if system pressure gets too high, it pushes against the ball & overrides spring tension. causing high pressure liquid to bypass the radar liquid unit to return to the pump.
    Delta System By-pass Valve
  12. + Removes dirt, contaminants etc. 
    + Two ways - of telling if the its dirty:

    1)Mechanical pop-up indicator will extend
    2) Delta pressure SW will send a signal to the ASP.
  13. + protects the reservoir from high pressure
    + allows you to drain the liquid & bleed air out of sys. 
    + located just off the reservoir.
    Bleed/Overboard Expansion Relief Valve
  14. - is used to energy the solenoid shutoff valve closed.

    2 POS: NORMAL & TEST. 

    + located on the pump assembly 
    + maximum time held @ test pos. is 6.5 mins w/o ac. 
    + w/ ac applied = min of 15 mins. 
    + four drops or > liquid coolant escape within a 15 min. period. pump/reservoir must be replaced.
  15. - is energized or de-energized by a test sw. on the pump assembly. 

    + Norms Pos : de-energized 
    + when test sw is in TEST POS, it is energized CLOSED. (makes coolant go thru H.E.)
    Solenoid Shutoff Valve
Card Set:
2014-01-22 09:13:06
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