What was found
AVIONICS BAY DOOR SURROUND INTERCOSTAL ON FWD SIDE BETWEEN FS.349.00 FS.364.00 AT 26L HAS MULTIPLE SPOTS OF CORROSION (MARKED). (C-CHECK RO 07/16/2025) INTERCOSTAL ORIGINAL MATERIAL THICKNESS IS 0.063" IAW CRJ900 SRM 53-21-23-001-003-A01. CORROSION IS ON TWO ELEMENTS OF THE INTERCOSTAL. IS OUT-OF LIMITS. REF, CRJ900 SRM 53-21-23-101-003-A02 "DAMAGE IS ALLOWED ONLY IN ONE ELEMENT AT A GIVEN CROSS SECTION". PART NEED TO BE REPLACEMENT. REMOVED AND INSTALLED NEW INTERCOSTAL ON FWD SIDE OF AVIONIC DOOR BETWEEN FS.349.00 FS.364.00 AT 26L REF CRJ900 SRM 51-42-06-001-001-A01 , SRM 51-42-21-001-001-A01 AND DWG SH670-32050 REV J. APPLIED FINISH AND CIC ON REPAIR AREA REF CRJ900 SRM 51-25-16-001-001-A01 AND SRM 51-21-11-001-001-A01. COMPLIED WITH 51-900-1002-SKY