AircraR
PublicaLions
Piper
Comanche
250
(Early Model)
Section
-
1
General
SYMBOLS, ABBREVIATIONS AND TERMINOLOGY (Cont.)
Payload The total weight of occupants, cargo and baggage, but not oil or fie[. Also, that part of
the
useful load from which revenue is derived.
PMA Parts Manufacturer Approval
-
An
authorization issued by the
FAA
to allow modification
or manufacture of a replacement part for sale for installation on a Type Certified product.
PPH Pounds Per Hour
-
The amount of fuel (in pounds avdp) consumed by the aircraft's engine
each hour.
Pressure Altitude The altitude read from an altimeter when the instrument's barometric scale is
set to
29.92
inches of mercury, and corrected for instrument and position error.
Reference Datum
An
imaginary vertical plane from which all horizontal distances are measured
for balance purposes. Also called Balance Station Zero.
RPM
Revolutions Per Minute
-
Engine speed measured in complete cycles of the engine
crankshaft.
SAE Rating Standard rating for lubricating oils established by the Society of Automotive
Engineers and based on Saybolt viscosity.
Service Ceiling The highest altitude
an
aircraft can obtain and still be able to climb at a rate of
100
feet per minute.
In
the case of a twin-engine aircraft operating on a single engine, the
figure is
50
feet per minute. This rate of climb is considered to be the lowest value practical
for operation.
Standard Empty Weight The weight of a standard production model aircraft as provided by the
manufacturer. This figure includes engine oil, unusable he1 and all other fluids for normal
operation although original Piper documentation did not always include these items.
Station A location along the aircraft fuselage given in terms of distance from the reference
datum.
Station Pressure Actual atmospheric pressure as measured at field elevation
STC Supplemental Type Certificate
-
An
authorization issued by the
FAA
for a major alteration
to an aircraft, engine or propeller that has been built under an Approved Type Certificate.
Supercharge The mechanical increase of air pressure (density) above ambient conditions
Takeoff Power The maximum brake horsepower that is developed under standard sea level
conditions and under maximum conditions of crankshaft rotational speed and engine
manifold pressure approved for normal
takeoff. In many cases Takeoff Power is limited to a
given period of time (typically five minutes for a piston engine) shown in the engine
specification.
Copyright: 1993
Page
1-17
To Next Page
Loading...
Need help?
General