Difference between master caution and master warning.

Hi guys, what is the difference between master caution and master warning on planes? By the sounds of it master warning sounds more serious then master warning.

Thanks :slight_smile:

Master caution is yellow (single chime in the type I fly) and draws your attention to a fault that requires your attention but does not pose an immediate threat to the safety of the aircraft.

Master warning is red (triple chime) and draws your attention to something that poses an immediate threat to the aircraft.

Examples of cautions include a generator off line, a failure of a hydraulic system, a failure of parts of the fuel system, a failure of the flap system, and so on. Typically a single failure generating a master caution can be dealt with and the flight continued to a convenient airfield, often the original destination.

Examples of a master warning include engine failure*, engine fire, cabin smoke, cargo smoke, depressurisation, and door unlocked. Typically immediate action is required and if the problem is not fixed an immediate diversion to the nearest airfield is required.

  • An engine failure is more exciting in a twin than a four engined jet, but they are master warnings regardless.

Seeing a gremlin would clearly be a master warning, as would a superhero and a supervillain conducting a running battle on the hull of the plane. Try to avoid flight plans that take you near Metropolis, Gotham City or The Twilight Zone.