I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 201
FOR SIMULATION USE ONLY – NOT A TRAINING AID
At forward centers of gravity, a pull force up to 8 pounds may be required to
maintain approach speed with power at IDLE during the final portion of the landing
with full nose-up pitch trim.
Maximum operating speed will require near full nose-down pitch trim at aft centers
of gravity.
NOTE
During rapid acceleration from low to high speed, the pilot will need to
initially trim nose-down to avoid a rapid build-up in forces.
Roll trim changes are relatively small throughout the flight envelope with balanced
fuel conditions. The roll trim authority is adequate to trim the aircraft laterally, with
the maximum allowable fuel imbalance of 50 pounds at all airspeeds and
configurations.
The directional trim system is effective in trimming the aircraft at all speeds within
the flight envelope.
At approach speeds or below with flaps in the LDG position, full nose right trim is
required at 100% torque.
TRIM AID SYSTEM
Directional trim is commanded by the trim aid computer as a function of engine
torque, indicated airspeed, pressure altitude, and pitch rate.
The system will not completely trim the aircraft directionally. The pilot must make
the fine trim inputs to keep the aircraft in coordinated/balanced flight throughout
the envelope.
Some feedback in the rudder pedals may be felt by the pilot during over-the-top
aerobatic manoeuvres as the system commands large trim changes necessary for
the airspeed excursions experienced during these manoeuvres.
Additionally, the pilot will encounter feedback from the system during large power
changes at low airspeeds when performing touch-and-go landings or go-around
manoeuvres.
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