Not an approved procedure, but in flight pull one engine to idle, put autofx to test this bypasses the column switch prop should immediately start to feather. if it does not, DO NOT LIFT THE POWER LEVERS. GROUND THE A/C TILL FURTHER WORK IS DONE I repeat DO NOT LIFT THE POWER LEVERS. GROUND THE A/C TILL FURTHER WORK IS DONE. Oh BTW AFX is a NoGo item on the 1900. Around this time of year with lower temps you will find that doing the AFX test on the ground will require you sneaking the Power lever into Beta