Radar Liquid Cooling System

Version 1

1. The primary purpose of the Radar Liquid Cooling System is to:
A. Pressurize fuel tanks
B. Remove heat from the radar transmitter
C. Cool cockpit air
D. Heat electronic bays

2. The system circulates:
A. Fuel
B. Hydraulic fluid
C. Liquid coolant
D. Air only

3. The Liquid to Air Heat Exchanger:
A. Adds heat
B. Removes heat from coolant
C. Stores coolant
D. Pressurizes air

4. Coolant flow is controlled by the:
A. Fuel valve
B. Temperature Control Valve
C. Pump switch
D. Air Data Computer

5. The centrifugal pump unit is:
A. Manual pump
B. Self-priming pump
C. Air-driven pump
D. Gravity-fed system

6. The ram air scoop is located in the:
A. Right wing
B. Left LEX
C. Tail section
D. Nose cone

7. The ram air scoop is driven by:
A. Hydraulic motor
B. Electric motor actuator
C. Pneumatic pressure
D. Fuel pressure

8. The ram air scoop closes when:
A. Engine is off
B. Weight is on wheels or hot air condition exists
C. Fuel is low
D. Battery fails

9. Ground cooling fan operation is:
A. Hydraulic
B. Fuel-driven
C. Electric
D. Pneumatic

10. The fluid pressure filter is located to:
A. Heat air
B. Filter coolant
C. Increase pressure
D. Control fuel

11. Filter contamination is indicated by:
A. Green light
B. Red indicator
C. Blue signal
D. Audio tone

12. Low pressure sensor sends signal to:
A. ECS
B. MSDRS
C. Radar display
D. Fuel system

13. Low pressure causes:
A. Normal operation
B. WPN SYS FAIL code
C. Cooling increase
D. Pump shutdown only

14. High temperature sensor monitors:
A. Air temperature
B. Coolant temperature
C. Fuel temperature
D. Cabin temperature

15. Liquid coolant temperature sensor sends data to:
A. Fuel controller
B. ACS Temp/Flow Controller
C. Hydraulic system
D. Radar antenna

16. Airflow valve is controlled by:
A. Pilot only
B. ACS controller
C. Fuel pump
D. Manual cable

17. Airflow valve function is to:
A. Increase fuel flow
B. Limit conditioned air
C. Shut down engine
D. Pressurize cabin

18. Ram air is used during:
A. Ground only
B. Normal flight
C. Emergency only
D. Engine start

19. Ground cooling air is supplied when:
A. Aircraft is airborne
B. Weight is on wheels
C. Engine is off only
D. Fuel is low

20. Heat is ultimately removed at the:
A. Pump
B. Heat exchanger
C. Fuel tank
D. Cockpit vent

Version 1 Answers

Version 2

1. RLCS primarily cools the:
A. Engines
B. Radar transmitter
C. Cabin air
D. Fuel system

2. Heat is removed using:
A. Fuel spray
B. Liquid-to-air heat exchanger
C. Hydraulic cooling
D. Oil cooler

3. The pump in the system is:
A. Gear pump
B. Centrifugal pump
C. Manual pump
D. Vacuum pump

4. Pump unit is described as:
A. Dry mounted
B. Self-priming and submerged
C. Engine-driven
D. Fuel-powered

5. Ram air scoop is mounted on:
A. Right wing
B. Left LEX
C. Tail
D. Nose gear

6. Ram air scoop is actuated by:
A. Electric motor
B. Hydraulic ram
C. Manual lever
D. Fuel pressure

7. Scoop closes due to:
A. Low fuel
B. Weight on wheels or hot air signal
C. Engine shutdown
D. Cabin pressure loss

8. Ground cooling fan provides:
A. Bleed air
B. Ambient air cooling
C. Fuel cooling
D. Hydraulic cooling

9. Filter removes contamination from:
A. Fuel
B. Coolant
C. Air only
D. Oil

10. Filter contamination indicator shows:
A. Blue flag
B. Red indication
C. Green light
D. No change

11. Low pressure sensor affects:
A. Fuel system
B. MSDRS
C. Landing gear
D. ECS

12. Loss of pressure results in:
A. Normal status
B. WPN SYS FAIL
C. Increased cooling
D. Fuel shutoff

13. High temp sensor is located in:
A. Air duct
B. Coolant line
C. Fuel tank
D. Electrical bay

14. ACS controller manages:
A. Fuel flow
B. Airflow valve
C. Engine thrust
D. Radar power

15. Airflow valve is:
A. Mechanical only
B. Pneumatically modulated
C. Fuel driven
D. Manual

16. Ram air is used in:
A. Flight
B. Ground only
C. Maintenance only
D. Engine shutdown

17. Conditioned air is used when:
A. Ram air is insufficient or hot
B. Fuel is low
C. Engine is off
D. Radar is off

18. Ground cooling occurs when:
A. In flight
B. Weight on wheels
C. High altitude
D. Engine boost

19. Temperature control is based on:
A. Pilot input only
B. Sensors and ACS controller
C. Fuel system
D. Electrical breakers

20. System is closed loop meaning:
A. Single use
B. Coolant recirculates
C. Air is lost
D. Fuel is used

Version 2 Answers

Version 3

1. RLCS removes heat from:
A. Cabin
B. Radar transmitter
C. Engine fuel
D. Hydraulic system

2. Heat exchanger transfers heat to:
A. Fuel
B. Cooling air
C. Oil
D. Electricity

3. Pump type is:
A. Gear
B. Centrifugal
C. Diaphragm
D. Vacuum

4. Reservoir is:
A. Single section
B. Two-section cylindrical
C. Wing tank
D. External tank

5. Ram air scoop provides:
A. Fuel flow
B. Cooling air
C. Hydraulic pressure
D. Cabin air

6. Scoop actuator is:
A. Manual
B. Electric motor driven
C. Fuel driven
D. Hydraulic only

7. Scoop closes when:
A. Hot ram air or WOW
B. Low fuel
C. Engine idle
D. Radar off

8. Ground fan is:
A. Engine driven
B. Electric
C. Hydraulic
D. Wind powered

9. Filter removes:
A. Electrical noise
B. Particles in coolant
C. Fuel vapor
D. Air moisture only

10. Filter contamination shows:
A. Green flag
B. Red indicator
C. Blue light
D. No change

11. Low pressure sensor sends signal to:
A. ECS
B. MSDRS
C. Engine display
D. Fuel system

12. Failure results in:
A. Normal status
B. WPN SYS FAIL
C. Cooling boost
D. Reset

13. High temperature sensor detects:
A. Air temp
B. Coolant temp
C. Fuel temp
D. Cabin temp

14. ACS controller manages:
A. Airflow valve
B. Fuel pump
C. Radar antenna
D. Hydraulic pump

15. Airflow valve is controlled by:
A. Electrical torque motor
B. Manual lever
C. Fuel pressure
D. Gravity

16. Ram air is used during:
A. Flight
B. Ground only
C. Parking
D. Shutdown

17. Conditioned air is used when:
A. Hot ram air condition exists
B. Fuel low
C. Engine off
D. Radar off

18. Ground cooling air is provided by:
A. Ram air scoop
B. Ground cooling fan
C. Engine bleed only
D. Cabin fan

19. Cooling control depends on:
A. Pilot only
B. Sensors + ACS controller
C. Fuel system
D. Electrical breakers

20. System type is:
A. Open loop
B. Closed loop
C. One-time use
D. Fuel-based