DURATION: 0.75 Hrs
OBJECTIVES
This lesson will introduce the student to helicopter piston engine theory and function.

Content
A) Model, type and horsepower rating

B) The four stroke cycle principle of operation
1) Compression ratio
2) Pre-ignition
3) Detonation
4) Relationship of valve timing/lift to horsepower
5) Scavenge effect in intake/exhaust

C) Part nomenclature of a helicopter piston engine and their relationship to the four stroke cycle
1) Crankcase
2) Crankshaft
3) Connecting rods
4) Pistons
5) Cylinder head
6) Valves
7) Rocker
8) Camshaft
9) Correlator

D) Piston engine induction systems
1) Fuel injection system operation 
2) Carburetor theory and operation
a) Relationship of atmospheric pressure/altitude to manifold pressure
b) Carburetor icing &amp; heat
c) Turbocharger theory and operation

E) Reciprocating engine performance
1)	Mixture Rich v Lean
2)	Engine indication systems

F) Electrical system
1) Battery
2) Alternator
3) Fuses and circuit breakers

G) Ignition system
1) Magnetos
2) Electronic ignition
3) Starter
4) Starting devices
a) Shower of Sparks
b) Impulse Coupling
c) Mag isolator
5) Spark plugs

H) Cooling systems
1) Air cooling
a) Impeller (cooling fan)
b) Fan scroll and cooling shroud
2) Liquid cooling

I) Oil and Oil system
1) Purpose of oil
2) Type and quantity
3) Wet sump system
4) Dry sump system
5) Contamination and filtration

COMPLETION STANDARDS
This lesson will be complete when, by oral examination, the student displays an understanding of the material presented and has completed the study assignment.