Discussion
Four displays are driven by two symbol generators, each capable of driving three screens. After one generator fails, the number of screens that can still be driven is
Answer: C
Correct answer: Three
Each generator can drive three screens, so after one fails the surviving generator can drive three of the four - one display is lost.
This is the standard architecture question: the display units may be four, but the redundancy is limited by the generators behind them. It is also why reversion switching exists, allowing the crew to choose which three are driven, so that the primary flight displays are retained and the least critical content is the content lost.
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