What is the purpose of fuel quantity indicators and what should you check before flight?

• A. Monitor remaining fuel; verify quantity matches planned usage plus reserves.
• B. Monitor engine oil level and temperature.
• C. Monitor cabin pressure and altimeter setting.
• D. Monitor airspeed indicator and compass heading.

Answer: (A)

The main idea is that fuel quantity indicators show how much usable fuel you have left, and you must confirm that the onboard quantity matches what your flight plan requires plus a safety reserve. Before you fly, you estimate your fuel burn for the trip (consider route, forecast winds, and any alternates) and compare that to the gauge reading. If the indicated fuel covers the planned usage plus reserves, you’re covered; if not, you either add fuel or revise the plan to stay within available fuel. This helps prevent running out of fuel and ensures you have a safety margin for delays or diversions. The other gauges mentioned (engine oil level/temperature, cabin pressure, altimeter setting, airspeed, heading) pertain to other systems and aren’t about validating fuel quantity for the flight.