Section 5
Model GA8-TC 320 Performance
CASA Approved
Page 5-2 5 Feb 2009 C01-01-08
5.1 GENERAL
The performance data on the following pages is presented for the pilot to know what to expect
from the aircraft under various conditions, and also to facilitate the planning of ights in detail
and with reasonable accuracy. The data has been computed from actual ight tests with the
aircraft and engine in good condition and using average piloting techniques.
Performance data is presented in tabular or graphical form to illustrate the effect of different
variables. Sufciently detailed information is provided in the tables so that conservative values
can be selected and used to determine the particular performance gure with reasonable
accuracy.
Cruise performance data assumes that the recommended lean mixture setting is used. Some
indeterminate variables such as mixture leaning technique, fuel metering characteristics, engine
and propeller condition, and air turbulence may account for variations of 10% or more in range
and endurance. It is therefore important to utilise all available information to estimate the fuel
required for a particular ight.
5.2 TAKE-OFF
The take-off distance charts presented on the following pages contains data enabling the take-
off distance to be determined for a variety of operating conditions and take-off power. The charts
allows for the take-off distance to be determined in feet or metres depending on the pilot’s
preference.
The charts are based on take-off distances from rest to a height of 50 feet with the engine
operating at take-off power. For pressure altitudes below 5000 feet, take-off power is set at
40 in Hg manifold pressure at 2500 RPM. For pressure altitudes above 5000 ft, take-off power
is limited at 38 in Hg manifold pressure at 2500 RPM. The surface corrections on the chart are
based on standard factors related to strips with a rm surface. Soft ground and unusually long
and/or wet grass will increase the take-off distance over that scheduled and the pilot should
therefore ensure that adequate strip length is available to cover these conditions.
Prior to commencing the take-off roll, the pilot must establish an accurate weight condition
and ascertain the scheduled rotation and take-off safety speed from the performance graphs
presented in this Section. The aps must be set to the take-off position.
The technique used in establishing the chart take-off distance involves holding the aircraft
against brakes and applying the necessary take-off power. Brakes are only released once
take-off power is achieved and all engine parameters have stabilised. During the take-off roll the
aircraft is accelerated on the ground with the elevators held in neutral. At the scheduled rotation
speed, the aircraft is positively rotated for lift-off. Once airborne, the correct pitch attitude must
be smoothly achieved and maintained to climb at the scheduled take-off safety speed, which
must be attained by 50 ft AGL.
Extrapolations outside the boundaries of the Take-Off Distance Charts are not permitted. When
the outside air temperature and/or pressure height is below the lowest range scheduled on the
charts, the aircraft performance shall be assumed to be no better than that appropriate to this
lowest range. The performance information is not valid when the outside air temperature and/or
pressure height exceeds the maximum values for which this information is scheduled.
01 Aug 2011
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