LESSON
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Compare your answers to the following solutions. If you answered any
item incorrectly, review the page(s) and paragraph(s) referenced
until you understand the instruction.
Item
Correct Answer and Feedback
1.
D.
Produces less air than the main NBC system with or
without the engine operating.
Because the NBC backup system does not use air from the
engine (bleed air), this system provides filtered air with
or without the engine running.
The NBC backup only
provides enough air for the crew's NBC masks; therefore, it
provides less filtered air than the main NBC protection
system. (page 2, para 1a)
2.
A.
16 ƒ 3.
When the output of the engine drops to below 400 shp, the
prioritization
regulating
valve
regulates
bleed
air
pressure at 16 ƒ 3 psig. (page 9, para 3)
3.
A.
16 ƒ 3.
If the high differential solenoid
fails to energize, the
valve will not know the engine is
producing more than 400
shp and will continue to regulate
bleed air pressure for
the lower shp, 16.3 psig. (page 9,
para 4)
4.
D.
Rectangular, offset.
For more efficient and
effective cooling, the heat
exchanger has rectangular
shaped fins that are offset.
(page 17, para 4)
5.
C.
In the recirculation and mixing duct just downstream
of the temperature control valve.
The conditioned air temperature sensor must sense the air
just before it enters the distribution duct so it obtains a
correct temperature. The system has this sensor located in
the recirculation and mixing duct for that purpose. (page
32, para 4)
44
OD1705
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