What was found
OVERSPEED WARNING INOPERATIVE. TESTED ON GROUND AND FOUND OVERSPEED WARNING SWITCH, PN 9912076-12, SN 173 TO BE OUT OF CALIBRATION. R & R SWITCH WITH OVERHAULED UNIT, SN 259 (PROCURED FROM MFG WITH A LAB TAG DATED AUG 12, 2009). TESTED AND UNIT FAILED. R & R SWITCH WITH INSPECTED UNIT, SN 09J108 (PROCURED FROM MFG WITH A LAB TAG DATED OCT 31, 2009). TESTED AND UNIT FAILED. R & R SWITCH WITH O/H UNIT, SN 152 (PROCURED FROM MFG WITH A LAB TAG DATED NOV 13, 2009). TESTED AND UNIT FAILED. R & R SWITCH WITH O/H UNIT, SN 191 (PROCURED FROM MFG WITH A LAB TAG DATED MAR 3, 2010). TESTED AND UNIT UNIT PASSED IAW AMM 34-11-10.