You can replace a large number of units during engine installation.

This section in the maintenance manual shall cover subjects such as engine changes, run-up, externally-mounted spare power plants, etc., while in the overhaul manual, it shall cover subjects such as power plant build-up, teardown, etc.

Propeller system includes the complete mechanical or electrical propeller, pumps, motors, governor, alternators, and those units and components external to or integral with the engine used to control the propeller blade angel.

Collector/ Nozzle includes items such as collector rings, exhaust and thrust augmentor ducts, variable nozzles, actuators, plumbing, linkages, position indicators, warning systems, etc.

Those units and components are used to generate, control, distribute electrical current to ignite the fuel air mixture in the cylinders of reciprocating engines or in the combustion chambers or thrust augmentors of turbine engines.

That portion of the system from the main quick disconnect to the engine, which distributes fuel to the engine burner section and the thrust augmentor. Includes items such as plumbing, pumps, temperature regulators, valves, filters, manifold, nozzles, etc. Does not include the main or thrust augmentor fuel control.

For reciprocating engines, those units and components which deliver metered fuel and air to the engine. The fuel portion includes the carburetor, master control from the inlet side to the discharge nozzle(s), injection pumps, carburetor, injection nozzles and fuel primer.

Engine fuel systems include coordinator or equivalent, engine driven fuel pump and filter assembly, main and thrust augmentor fuel controls, electronic temperature datum control, temperature datum valve, fuel manifold, fuel nozzles, fuel enrichment system, speed sensitive switch, relay box assembly, solenoid drip valve, burner drain valve, etc.

For turbine engines, those units and components and associated mechanical systems or electrical circuits which furnish or control fuel to the engine beyond the main fuel quick disconnect; and thrust augmentor, fuel flow rate sensing, transmitting and/or indicating units whether the units are before or beyond the quick disconnect.

Those units and components are used to distribute oil throughout the engine, including front and rear pressure and scavenger pumps, sumps, strainers, valves, etc. Also includes those oil lines not included in Chapter 79.

The engine compressor control system is used to both control the flow of air through the engine and facilitate the operation of variable stator blades, and is comprised of several components such as governors, valves, actuators, and linkages.