GRUMMAN AMERICAN
FOR TRAINING USE ONLY – SECTION 1
MODEL GA-7/COUGAR
GENERAL
1-10
Issued: April 10, 1978
ENGINE CONTROLS AND INSTRUMENTS
Throttle
Controls
The levers used to control the induction of a fuel-air mixture into the intake passages of an
engine.
Mixture
Controls
These levers, in the idle cut-off positions, stop the flow of fuel and in the intermediate
through full rich positions, regulate the fuel-air mixture.
Propeller
Controls
These levers request the governor to maintain rpm at a selected value and in the Maximum
decrease rpm position, feather the propellers.
Propeller
Governor
The propeller governors maintain the selected rpm requested by the propeller control levers.
Manifold
Pressure Gauge
The manifold pressure gauge measure the absolute pressure in the intake manifold of the
engine, expressed in inches of mercury (In. Hg.).
Tachometers
Tachometers indicate the rotational speed of the propellers (and engines) in revolutions per
minute (rpm).
