What was found
FLYING STRAIGHT AND LEVEL IN VMC CONDITIONS AIR SPEED INDICATING JUST UNDER 160, THE STALL SHAKER INITIATED, MAX POWER WAS APPLIED FOLLOWED BY PITCHING ACFT ATTITUDE TO INCREASE A/S WITH NO EFFECT. RED 'STALL' (RT) GLARESHIELD LIGHT ILLUMINATED. CONDITION PERSISTED THROUGH 180 KIAS DURING DESCENT. RED 'STALL' LIGHT WAS PRESSED FOLLOWED BY TURNING OFF THE STALL SYSTEM.