Aircran Publicntions
Pipcr Cammchc
231
(Early Model)
Section
-
1
General
SYMBOLS, ABBREVIATIONS AND TERiilINOLOGY (Cont.)
Tare The weight of chocks, blocks, stands, etc. used when weighing an aircraft. Tare is
deducted from the scale reading to obtain the actual (net) aircraft weight.
TAS Tme Airspeed
-
The speed of an aircraft relative to undisturbed air which is the CAS
corrected for altitude, temperature and compressibility.
TBO Time Between Overhauls
-
An
interval recommended by the manufacturer for re-building
the engine. If the aircraft is operated commercially, this time interval is mandatory.
TBS Turbo Supercharger
-
More commonly referred to as "turbocharger".
An
exhaust gas
driven air compressor that is used to increase the power of a reciprocating engine or to assist
in maintaining power at high altitudes.
TIT
Turbine Inlet Temperature
-
Temperature of the engine's exhaust gas as it enters the turbine.
Used to measure critical operation of the engine. TIT is considered to be the best parameter
for engine control and monitoring, although EGT is more common.
True Altitude The height of the aircraft above sea level when the altimeter's barometric scale is
set to the local altimeter setting and corrected for a nonstandard temperature lapse rate.
True altitude, pressure altitude and density altitude are all equal at standard atmosphere.
TSO Technical Standard Order
-
A
set of s~ecifications issued by the
FAA
outlining
-
environmental and performance capabilities for various types of equipment used in an
aircraft.
A
~artial list of TSOed equipment includes: radios, instrumentation, tires, wheels,
.
.
brakes, seat belts and hoses.
Turbine The exhaust driven end of the turbocharger unit.
Turbo-Normalizing The use of a turbocharger to regain up to, but not more than, sea level
power, and to regain the power loss caused by decreased air pressure at high altitudes.
Unusable Fuel The quantity of he1 that can not be safely used in critical flight attitudes. Also,
any residual hel that will not flow through the aircraft's fuel system. Unusable Fuel is not
available for flight planning purposes. Fuel designated as unusable in the single-engine and
twin Comanche is available, but only in level flight.
Useful Load The difference between takeoffweight, or ramp weight as applicable, and basic
empty weight. Useful Load, as it is used in this Handbook, consists of the pilot, passengers,
baggage and usable fuel. In original Piper documentation, this figure may or may not include
engine oil.
VFR
Visual Flight Rules
-
Rules that govern the procedures for conducting flight under visual
meteorological conditions. VFR weather minima are outlined in Federal Aviation
Regulations under Part
91
and Part
135.
Copyright:
1993
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