Full Authority Digital Engine Control (FADEC). An engine control system in which the primary functions are provided using digital electronics and in which the electronic engine control (EEC) unit has full-range authority over the engine power or thrust.
Full-up Configuration. An EECS that has no known faults or failures present that affect the loss of thrust (or power) control rate.
Local Events. Failures of aircraft systems and components, other than the EECS, that may affect the installed environment of the EEC unit.
Loss of Power Control (LOPC). A ECS failure event resulting in the inability to attain at least 85% of rated power or to modulate power under normal operating conditions.
Loss of Thrust Control (LOTC). An ECS failure event on a turbine engine that results in the inability to attain at least 90% of rated thrust or to modulate thrust under normal operating conditions.
Minor Power Loss (MPL). A reciprocating engine ECS failure event resulting in the ability to attain less than 95%, but still greater than 85%, of rated power.
Primary Mode. The mode for controlling the engine under normal operation; often referred to as the ‘normal mode.
Primary System. The part of the ECS/PCS normally used for controlling the engine/propeller operation.
Programmable Logic Device (PLD). An electronic component that is altered to perform an installation specific function. PLDs include, but are not limited to, Programmable Array Logic (PAL) components, General Array Logic (GAL) components, Field Programmable Gate Array (FPGA) components, and Erasable Programmable Logic Devices (EPLDs). These devices are a subset of AEH.
Propeller Control System (PCS). Any system or device that is part of the propeller type design that controls, limits, or monitors propeller operation.
Redundancy. Multiple independent methods incorporated within a system to accomplish a given function.
Time-Limited Operations (TLO). The duration of reciprocating engine flight operations permitted with the EEC system in a degraded condition.
Uncovered Fault. A fault or failure for which either no detection mechanism exists or, if detected, no accommodation exists.
Unsafe Condition. For the purposes of this AC, any malfunction or failure of a reciprocating engine EECS that could result in a destructive event or EECS LOPC and MPL rate in excess of A5-3
those specified in Tables A3-1 and A3-2 of this AC. This definition is intended to apply to reciprocating engine EECS.
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