What was found
"ANTENA DOUBLER F.S. 295-310 STR 27 CORRODED. UPON FURTHER INVESTIGATION, FOUND CORROSION ON ANTENNA DOUBLER AT F.S. 295-310 STR 27, ORIGINAL MATERIAL THICKNESS OF 0.050"", AFTER CORROSION REMOVAL OF 0.050"", 100% MATERIAL LOSS, DOUBLER FOUND TO BE OUT OF LIMITS, REQUIRES REPLACEMENT. IAW CRJ900 SRM 53-21-01-101-002-A04 AND SRM 51-21-06-001-001-A01. REMOVED TCAS OMNIDIRECTIONAL ANTENNA. IAW CRJ900 AMM 34-43-07-000-801-A01 INSTALLED TCAS OMNIDIRECTIONAL ANTENNA, IAW CRJ900 AMM 34-43-07-400-801-A01 OPERATIONAL TEST OF THE TCAS IS GOOD IAW CRJ 900 AMM TASK 34-43-00-710-801-A01 INSTALLED 4EA NUT PLATE P/N:NAS1473A3 ON ANTENNA DOUBLER F.S. 295-310. IAW CRJ900 SRM 51-42-06-001-001-A01. CORROSION FOUND ON STGR27 BETWEEN F.S 280.00 TO F.S. 295.00 DOCUMENTED ON MHIRJ MWC HN00182860, SN 699. REMOVED UNSERVICEABLE ANTENNA DOUBLER F.S. 295-310 STR 27, IAW CRJ900 SRM 51-42-21-001-001-A01 AND SRM 51-42-06-001-001-A01. LOCATED AND DRILLED NEW SERVICEABLE ANTENNA DOUBLER F.S. 295-310 STR 27 (P/N:SH670-32364-7S) IAW CRJ900 SRM 51-40-11-001-001-A01. INSTALLED NEW SERVICEABLE ANTENNA DOUBLER F.S. 295-310 STR 27 (P/N:SH670-32364-7S) IAW CRJ900 SRM 51-42-21-001-001-A01 AND SRM 51-42-06-001-001-A01."