ITEMS 4-53 THROUGH 4-62 PERTAIN TO THE
F-18 AVIONICS COOLING SYSTEM.
4-53.
The air taken from the aircraft
air-conditioning system to cool
avionic equipment is controlled
by which of the following
components?
1.
ECM cooling air control valve
only
2.
Avionics RAM air valve only
3.
ECM cooling air control valve
and avionics ram air valve
4.
Avionics flow/temperature
sensor and temperature/flow
controller
4-54.
A pressure differential of 1.5
psi between the avionics cooling
system and the air cycle air-
conditioning system is maintained
by which of the following
components?
1.
Avionics flow/temperature
sensor
2.
Avionics flow valve
3.
ECM cooling air control valve
4.
Avionics ram air valve
4-55.
Air that comes through the
avionics ram air valve to augment
avionics cooling comes from which
of the following sources?
1.
Secondary heat exchanger ram
air inlet
2.
Liquid cooling system
3.
Emergency ram air scoop
4.
Air cycle air-conditioning
system
4-56.
What component in the avionics
cooling system operates the
avionics ram air valve?
1.
Avionics flow/temperature
sensor
2.
Pressure switch and the
secondary heat exchanger
3.
ECM cooling air central valve
4.
Avionics ram air servo
4-57.
Which of the following components
controls the amount of airflow
that will be directed to the ECM
equipment for cooling purposes?
1.
Avionics ram air valve
2.
Emergency ram air scoop
3.
ECM cooling air control valve
4.
Avionics fan control pressure
switch
28
4-58.
What component controls the
position of the ECM cooling air
control valve?
1.
ECM made switch
2.
ECM cooling air control valve
switch
3.
Avionics fan control pressure
switch
4.
Avionics airflow control
valve switch
4-59.
Under which of the following
conditions does the aircrafts
avionics ground cooling fan cool
avionics equipment?
1.
During ground operation only
2.
During ground operation and
taxi only
3.
During takeoffs only
4.
During ground operation,
taxi, takeoffs, and landings
4-60.
(Refer to figure 3-11 and
supporting material in the text.)
What prevents cooling air in the
avionics system from escaping
through the ground cooling duct
during flight?
1.
Avionics ram air check valve
2.
Nose wheel well plenum check
valve
3.
Avionics fan check valve
4.
Avionics airflow check valve
4-61.
(Refer to figure 3-11 and
supporting material in the text.)
The avionics fan control pressure
switch will operate the avionics
ground cooling fan when which of
the following conditions exist?
1.
During low airspeed flight
operation
2.
During all flight and ground
operation
3.
When the avionics ram air
valve fails
4.
When the air cycle air-
conditioning systems
pressure is below 26±1 psig