50 FTS Check Flight Smart Book Practice Test

Which set of lights turn on when the battery is turned on for a battery start?

Eng Anti-Ice, XMFR Rect Out Left Gen, Right Gen Left Fuel Press, Right Fuel Press Left Gen, Right Gen, Utility Hydraulic, Flight Hydraulic, Left Fuel Press, Right Fuel Press, Eng Anti-Ice, XMFR Rect Out

Correct Answer:

Left Gen, Right Gen, Utility Hydraulic, Flight Hydraulic, Left Fuel Press, Right Fuel Press, Eng Anti-Ice, XMFR Rect Out

Explanation:

When the battery is switched on for a start, the electrical system brings up a set of indicators that show power is available to the essential systems. The lights you’d expect to see lit together indicate that both generator buses are ready, that hydraulic circuits are powered, that fuel lines are pressurized, that engine anti-ice is enabled, and that DC power is being supplied to the essential buses via the XMFR Rect Out path. In other words, this combination confirms the aircraft has the required power and readiness across generators, hydraulics, fuel, anti-ice, and the transformer-rectifier supply before the start proceeds. Other options omit one or more of these critical indicators, so they don’t reflect the full power-up state you get from a battery start.

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