Turbine engines have evolved into highly reliable powerplants with long service lives.

ignition occurs when there is an excessively rich fuel/air mixture.

can occur anytime something is drawn into a gas turbine engine.

most engines had specified numbers of hours they could operate before they needed to be overhauled. This period became known as the

 the TBO method of limiting the engine's life on-wing has been replaced by the

 is essentially a powerplant with the necessary accessories already installed on the engine mounting assembly.

includes a complete disassembly and inspection. accomplished by the manufacturer or at approved overhaul stations.

 are processed and then given a rigid inspection and/or test to ensure that they are serviceable.

 are discarded, and those salvageable through rework or recycling are sent to an appropriate facility.

Turbine engines are disassembled either vertically or horizontally.