Type-Rating - B747 B747 Type Rating

Air Systems

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Question 21214
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Which of the following best describes the results of rotating the Equipment Cooling selector to the STBY position?
A
The equipment cooling system warms up prior to selecting NORM for flight.
B
The equipment cooling ground exhaust valve closes and the inboard exhaust valve opens to configure the system for flight.
C
The equipment cooling ground exhaust valve opens when ambient temperature is greater than 50 F (10 C).
D
The aft outflow valve automatically closes.