Type-Rating - B747 B747 Type Rating

Fire Protection

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Question 21407
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Normally, what does the EICAS message >DET FIRE/OHT 1 mean?
A
Both loops A and B in either the fire or overheat detection loops for engine 1 have failed.
B
Both loops A and B in both the fire and overheat detection loops for engine 1 have failed.
C
Loops A or B in both the fire and overheat detection loops for engine 1 have failed.
D
Loops A or B in either the fire or overheat detection loops for engine 1 have failed.