PSlA
PSlG
PPH
Rear
Rec.
Right Side
R.P.M.
Std.
TBO
T.D.C.
T.I.T.
Torque
Pounds Per Square lnch Absolute
Pounds Per Square
lnch Gauge
Pounds Per Hour
Accessory End of Engine
Recommended
Side on which No's 1, 3, and
5
cylinders are
located. (Rear to Front)
Revolutions Per Minute
Standard
Time Between Overhaul
Top Dead Center
Turbine inlet Temperature
Force x lever arm (1 25
ft.-lbs. torque
=
125 Ibs.
Force applied one
ft.
from bolt center or 62-1 /2 Ibs.
applied
2
ft.
from center), etc.
10-02
DEFINITIONS
ADMP
Absolute dry manifold pressure, is used in establishing a baseline standard of engine perfor-
mance. Manifold pressure is the absolute pressure in the intake manifold; measured in inches
of mercury.
Ambient A term used to denote a condition of surrounding atmosphere at a particular time. For
example; Ambient Temperature or Ambient Pressure.
BHP Brake Horsepower. The power actually delivered to the engine propeller shaft. It is called
brake horsepower because it was formerly measured by applying a brake to the power shaft of
an engine. The required effort to brake the engine could be converted to
horsepower-
hence: "brake horsepower."
BSFC Brake Specific Fuel Consumption. Fuel consumption stated in pounds per hour per brake
horsepower. For example, an engine developing 300 horsepower while burning 150 pounds of
fuel per hour, has a BSFC of
.5.
Fuel Consumption in PPH
Brake Horsepower
Cavitation
Cold Soaking
Corrosion
Critical Altitude
Density Altitude
Formation of partial vacuums in a flowing liquid as a result of the
separation of its parts.
Prolonged exposure of an object to cold temperatures so that its tempera-
ture throughout approaches that of ambient.
Deterioration of a metal surface usually caused by oxidation of the metal.
The maximum altitude at which a component can operate at 100%
capacity. For example, an engine with a critical altitude of 16,000 feet
cannot produce 100% of its rated manifold pressure above 16,000 feet.
Altitude as determined by pressure altitude and existing ambient tempera-
ture. in Standard Atmosphere (IAS) density and pressure altitudes are
equal.
For a given pressure altitude, the higher the temperature, the
higher the density altitude.
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