What was found
INVESTIGATED PILOT REPORT OF HORIZ STABILIZER L/E ANTI-ICE SYS FAIL INDICATION. AFTER EXTENSIVE TROUBLESHOOTING, FOUND RT ICE DETECTOR WOULD SHOW A FAIL INDICATION WHEN PROBE WAS LIGHTLY COVERED BY A RAG. IF TESTED IAW STEP 3 OF MM 30-11-00-501 OPS TEST WITH A LIGHT FINGER PRESSURE ON THE PROBE, WOULD NOT INDICATE A FAILURE. REPLACED THE RT ICE DETECTOR AND SYS TESTED NORMAL. RECOMMEND MFG INVESTIGATE A MORE ACCURATE METHOD OF TESTING ICE DETECTOR OPERATIONS.