õhusõiduki pardal olev koostisosa ei täida oma ettenähtud eesmärki või ei toimi korrapäraselt oma talitluse või lubatud hälbe piirides
in relation to an airborne constituent means that the constituent does not accomplish its intended purpose or is not consistently functioning within its operating limits or tolerances
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Valdkond ICAO lisade põhjal loodud klassifikaatori järgi: Lennuliikluse korraldamine
The operator shall include in the operations manual a minimum equipment list (MEL), approved by the State of the Operator which will enable the pilot-in-command to determine whether a flight may be commenced or continued from any intermediate stop should any instrument, equipment or systems become inoperative.