The basic engine values in the Cirium Values Analyzer assume a “bare” configuration. This will typically be an engine as delivered by the engine manufacturer, without quick engine change (QEC) hardware attached. In order for the engine to be installed on the aircraft, it is necessary to add a QEC kit and other hardware. The definitions of what constitutes a QEC differs between the engine manufacturers and various Specification Adjusters include the following:
Full QEC is assumed to represent an engine ready for installation on the aircraft. This will include the basic engine hardware, all buyer furnished equipment, QEC hardware and, depending on the engine model, exhaust nozzle and inlet cowl. This is typically a General Electric Aircraft Engines definition.
Neutral QEC consists of a full QEC engine less several major line replaceable units (LRUs). Please refer to the individual engine's configuration listing for the actual hardware installed.
Each engine type has its own QEC nomenclature, and some, such as the LEAP, have lots of options. Our QEC Specification Adjusters follow the OEM naming and their definitions, so we don’t specifically have our own definition. It’s best to check with the manufacturer, but here is a quick guideline for the LEAP QEC modifiers and what they include:
- Basic QEC: EBU
- Medium 1 QEC: above + Hydraulic pumps & valves
- Hybrid Medium QEC: in between Medium 1 and 2
- Medium 2 QEC: above + Electrical System and Engine Mounts
- Hybrid Medium Plus QEC: above + some exhaust components
- Full QEC: all of above including exhaust and inlet
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