4-7.
4-8.
4-9.
4–10.
What is the purpose of the two
overpressure switches in the
bleed-air system?
1. To protect the system compo-
nents from damage due to
excessive pressure
2. To prevent excessive pressure
buildup in the engine com-
pressor section
3. To maintain the desired
pressure in the cabin during
cabin pressurization
4. TO vent pressure overboard
when excessive pressure
exists in the air-
conditioning system
When electrical failure occurs in
an operating air-conditioning
system, what action is taken by
the spring-loaded engine bleed-
air pressure regulation valve?
1.
It remains in the position it
was in at the time of
electrical failure
2.
It is powered to the open
position by the spring
tension
3.
It is powered to the closed
position by spring tension
4.
It requires manual operation
to the desired position
What component) in the bleed-
air system maintain bleed-air
pressure from the engines within
75±15 psi?
1.
Engine bleed check valves
2.
Primary bleed-air over–
pressure switch
3.
Engine bleed-air pressure
regulation and shutoff valves
4.
Engine bleed-air secondary
pressure regulating and
shutoff valves
In the event bleed-air pressure
becomes higher than normal due to
a malfunction, what component in
the system will take over and
regulate air pressure?
1.
Engine bleed-air secondary
pressure regulating and
shutoff valve
2.
Engine bleed check valve
3.
Primary bleed–air over–
pressure switch
4.
Secondary bleed-air over–
pressure switch
4-11.
Which of the following statements
is correct regarding the purpose/
function of the primary bleed-air
overpressure switch?
1. The switch will activate at
250 psi maintaining the
system at that pressure when
normal regulation fails
2. Activation of the switch will
give maintenance personnel
data for determining mal–
functions in the bleed-air
system
3. The switch will activate a
digital display indicator on
the instrument panel warning
the pilot of a bleed–air
system failure
4. Activation of the switch will
close three pressure
regulator shutoff valves,
shutting down the bleed-air
system
4-12.
Which of the following circum-
stances will cause the secondary
bleed-air overpressure switch to
activate?
1. Right engine bleed–air
pressure-regulator and
shutoff valve failure only
2. Left engine bleed-air
pressure regulator and
shutoff valve failure only
3. Failure of both right, and
left engine bleed-air
pressure regulation and
shutoff valves
4. Bleed-air pressure downstream
of the secondary bleed-air
regulator exceeds 150±10 psi
4-13.
What valve(s) in the bleed-air
system provide(s) bleed air from
the operating engine to start the
second engine?
1.
Engine bleed-air check valve
2.
Air isolation valve
3.
Engine bleed–air secondary
pressure valve
4.
Engine bleed-air pressure
valve
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