In the event a spin is entered unintentionally, recovery actions should be taken immediately as considerable loss of altitude can result. If the aircraft is not certified for intentional spins or if the centre of gravity is beyond the aft limit, recovery may not be achievable.
If a specific spin recovery procedure has been identified by the aircraft manufacturer, that procedure must be used. Otherwise, recovery from an upright spin may be achieved by following the "PARE" mnemonic procedure first developed in the 1930's by NACA:
P - Power Idle - Reduce power on all engines to idle.