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 | 213
FOR SIMULATION USE ONLY – NOT A TRAINING AID
Spins below 10,000 feet MSL are prohibited due to high stresses on the propeller
which occur during the spin manoeuvre with the propeller RPM below 80%. To
prevent high stresses from occurring, the power management unit (PMU) artificially
maintains propeller RPM at 80% with the PCL at IDLE when the aircraft is above
10,000 feet MSL.
NOTE
During a spin, oil pressure may decrease below 40 psi with idle power. This
is acceptable provided no operating limits are exceeded and normal
indications return after recovery.
Erect Spins
Entry into idle power, erect spins is characterized by roll and yaw in the direction
rudder is applied, resulting in a barrel roll manoeuvre to a near level attitude after
completing the first turn.
After completing the initial turn, the nose will pitch to approximately 60° below the
horizon, with pitch attitude becoming oscillatory. After completing approximately 3
turns, the spin will have entered a near steady-state condition.
Spin rotation rates will stabilize to approximately 2 to 3 seconds per turn with
altitude loss of 400 to 500 feet per turn.
The angle of attack will be 18+ and airspeed will stabilize at 120 to 135 KIAS.
The turn needle will be fully deflected in the direction of the spin. In performing
spins to the left, the pilot may notice some differences in pitch attitude and
magnitude of pitch, roll, and yaw oscillations.
Spins in either direction may exhibit roll and yaw oscillations after 3 turns with
neutral ailerons.
Ailerons have a pronounced effect on spin characteristics.
With ailerons held in the direction of spin rotation, roll and yaw become noticeably
oscillatory. With ailerons held full opposite to direction of spin rotation, roll and yaw
oscillations are damped out and the spin appears to reach steady state in all axes.
Applying full left aileron simultaneously with right rudder tends to slow the initial
entry into a right spin.
To Next Page
Loading...