What was found
FUSELAGE SKIN REPAIR DOUBLER, ANTENNA DOUBLER, AND ADAPTER PLATE AT LOWER TCAS ANTENNA HAVE SURFACE CORROSION. REMOVED CORROSION ON FUSELAGE SKIN REPAIR DOUBLER IAW SRM 51-21-00, FOUND TO BE IN LIMITS IAW RD8/4-53-505. DOUBLER CORROSION OUT OF LIMITS FABRICATED ANTENNA DOUBLER IAW DWG 85314193-103. REMOVED CORROSION ON ADAPTER PLATE IAW SRM 51-21-00 NO ALLOWABLE LIMITS FOR ADAPTER PLATE. RECEIVED NEW ADAPTER PLATE AND MATCH DRILLED TO STRUCTURE IAW Q400 51-40-07-02-01. TREATED AND PAINTED SKIN REPAIR DOUBLER AND ANTENNA DOUBLER IAW SRM 51-21-10-02-01 AND 51-25-05-02-01. INSTALLED DOUBLER AND ADAPTER PLATE IAW SRM 51-42-05-02-01.