Definition
A feature built into some fuel quantity indicating systems that automatically alerts the pilot, usually by an illuminated warning light or message, when the fuel remaining in a tank drops below a preset low level.
Plain English
It is a built-in warning that lets the pilot know the fuel is getting low, so they do not have to rely only on watching the fuel gauges.
Context Anchor
Seen when discussing cockpit warning systems, fuel gauges, and modern airplane displays.
Why Pilots Care
Ensures the pilot receives timely notice of low fuel state to avoid exhaustion and potential engine failure.
Intuition Check
Do not assume low-fuel alarm capability means the airplane still has plenty of safe flying time left. It only means the airplane can warn you that the fuel has reached a low level set by the system.
Example Sentence 1
During the descent, the low-fuel alarm illuminated, prompting the pilot to switch tanks and review the remaining endurance.
Example Sentence 2
Modern glass cockpit displays incorporate low-fuel alarm capability as part of the engine indication system.