What was found
STRINGER 21L CORRODED FWD OF BS 319. REMOVED CORROSION FROM FS319 BETWEEN STR 21L AND STR 20L IAW SRM 51-21-06-001-001-A01. PERFORMED UT THICKNESS MEASUREMENTS OF REWORKED AREAS IAW NDTM PART 1, 51-20-004-270-A01, REV-37. FOUND LOWEST REMAINING THICKNESS TO BE .028" OR GREATER. FS 319 ORIG. THICKNESS: 0.050", REMOVED: 0.022", REMAINING: 0.028" FOUND TO BE OUT OF LIMITS IAW SRM 53-21-23-101-001-A02. INSTALLED FASTENERS & ATTACH ANGLE AT BS 319 IAW SRM 51-42-06-001-001-A01. LOCATED & DRILLED NEW FRAME IAW SRM 51-40-11-001-001-A01. INSTALLED FRAME SECTION FS319 BETWEEN STR 18L AND STR 21L IAW CRJ900 SRM 51-42-06-001-001-A01 AND 51-42-21-001-001-A01.