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 | 212
FOR SIMULATION USE ONLY – NOT A TRAINING AID
SPIRALS
A spiral is a rolling and/or yawing motion of the aircraft that is often mistaken for a
spin, but is not steady-state in that airspeed is increasing through 160 KIAS and
motions are oscillatory. A spiral can result from misapplication of pro-spin controls
(insufficient rudder or aft stick).
It is important to identify a spiral quickly, because the airspeed can increase rapidly
in a nose-down attitude.
Maintaining large control deflections as speed increases can result in rapid motions
and structural over-stresses. Anti-spin controls may not be effective in arresting
the spiral and may actually aggravate the situation.
The best response to a spiral is to reduce the power to IDLE and neutralize the
controls until motion stops.
SPINS
A spin requires stalled angle of attack simultaneously with sustained yaw rate. If
either of these two conditions is absent, the aircraft will not enter a spin.
For erect stalls, angle-of-attack information is available by direct reference to the
angle-of-attack indicator and indirectly through the stick shaker.
Maintaining the AOA below that required to activate the stick shaker is an effective
means of avoiding a stall.
For both erect and inverted stalls, maintaining the aircraft in balanced flight (slip
ball centred) will prevent build-up in yaw rates required to enter a spin.
SPIN CHARACTERISTICS
Only intentional erect spins with landing gear, flaps, and speed brake up and power
at IDLE are permitted.
A spin may be entered by maintaining full aft stick and applying full rudder in the
desired spin direction at 80 KIAS.
CAUTION
Spin entry attitudes greater than 50 degrees nose high may result in low oil
pressure and engine damage.
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