Mayday Fuel Emergency

What is a Mayday Fuel Emergency?

A mayday fuel emergency is a formal distress declaration made by the pilot when the usable fuel on board will not be sufficient to land with final reserve fuel at the nearest suitable aerodrome. This is communicated by transmitting "MAYDAY MAYDAY MAYDAY FUEL" to ATC, immediately triggering emergency procedures and priority handling.

When to Declare Mayday Fuel

You must declare a mayday fuel emergency if, after assessing all available options, you calculate that the aircraft will land with less than final reserve fuel. This is distinct from a "minimum fuel" state, which is a cautionary advisory to ATC that any further delay or deviation may result in a fuel emergency, but does not yet require emergency handling.

Mayday Fuel vs Minimum Fuel

• Minimum Fuel: Used when committed to a specific destination, and any change to the clearance could result in landing with less than final reserve fuel. It is a warning, not an emergency.
• Mayday Fuel: Declared when it is certain that landing with less than final reserve fuel is unavoidable. This is an emergency and requires immediate ATC action.

Mayday Fuel Radio Call

The correct radio call is: "MAYDAY MAYDAY MAYDAY FUEL". This informs ATC that the aircraft requires immediate priority due to a fuel emergency.

Operational Procedures and Decision Making

Pilots must continually monitor fuel status and reassess the flight plan as conditions change. If delays, weather, or rerouting threaten fuel reserves, the commander must act decisively—first by declaring minimum fuel if necessary, and escalating to mayday fuel if the situation deteriorates.

Exam Focus

Expect questions that test your ability to distinguish between minimum fuel and mayday fuel, the correct radio phraseology, and the operational triggers for each declaration.