What was found
FLT #1, WHILE CONDUCTING NORMAL HOVER FLIGHT ON HOVER TAXI LANE, MAST MOMENT EXCEEDANCE MESSAGE RECEIVED. MM INDICATED VISUALLY ON CAD SCREEN 71% AT THE 7 O'CLOCK POSITION. WITH MM EXCEED CAD CAUTION MESSAGE, THEN RETURNED TO NORMAL FOR ABOUT 2 SECONDS THEN MM EXCEED INDICATED AGAIN 71% AT THE 7 O'CLOCK POSITION. LANDED A/C IMMEDIATELY. INDICATION ON SHUTDOWN REPORT SAID >64% FOR 2.2 SECONDS, > 77% FOR 1.4 SECONDS AND >90% FOR .8 SEC. REPLACED SSTU IAW 63-42-00, 4-2. 30 MINUTE TEST FLIGHT COMPLETED IAW UH72 RFM.