I A P 2 0 2 1 . 0 0 1 - A F M /
I R I S G 1 1 5 E / T U T O R T . 1
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FOR SIMULATION PURPOSES ONLY
Endurance.
Best endurance is obtained by flying the aircraft at the
power settings given in the Checklists, with the flaps UP and at the
lowest practical safe altitude.
Descending
Cruise Descent.
The normal descent technique used in the IRIS G115E /
Tutor T.1 is the Cruise Descent. It is flown at 100 kts, using 10" MP, which is
sufficient power to keep the engine warm during the descent and free
from plug fouling.
Gliding.
The recommended gliding speed is 75 kts. In still air with the
throttle closed, the clean aircraft travels approximately 1.25 nm per
1000 ft height loss with the RPM control set to HIGH and 1.5 nm per 1000
ft with LOW RPM set.
CHT reduces quickly during a closed throttle descent and the spark plugs
rapidly become contaminated with oil. Power response may then be poor
and engine damage may occur.
Following a simulated engine failure, to sustain the CHT and prevent the spark
plugs from oiling up, the engine must be warmed at regular intervals during
descent by applying full power for about 3 seconds.
These engine warms should be performed at least every 1000 ft to prevent
oiling up. The CHT must not be allowed to fall below 65ºC, and ideally not
below 100ºC.
