Discussion
Statement I: Standby instruments run from independent sensors and power.
Statement II: A common failure could otherwise remove every attitude reference at once.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second is the reason for the first. Standby instruments run from their own sensors, their own power - typically including a dedicated battery - and their own display, sharing nothing with the main system.
Without that independence, a single failure of the symbol generators, the display power supply or a main electrical bus could remove every attitude reference at once, leaving the crew with no means of keeping the aircraft upright in cloud. The standby is the last line of defence, so its value lies entirely in what it does not share.
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