What was found
L/H AND R/H FWD JACK PAD INTERCOSTALS ARE CORRODED BETWEEN F.S.265 TO F.S.280. NOSE JACK PAD FITTING SUPPORT INTERCOSTALS ARE IDENTIFIED AS P/N CC670-32179-3 (L/H) AND CC670-32179-4 (R/H) AND HAVE HEAVY CORROSION ALONG ATTACHED FLANGE. NO ALLOWABLE DAMAGE LIMITS PROVIDED IN CRJ-900 SRM. SUPPORT INTERCOSTALS REQUIRE REPLACEMENT. LOCATED AND DRILLED L/H INTERCOSTAL CC670-32179-3 AND R/H INTERCOSTAL CC670-32179-4 AT BL 0 BETWEEN FS 280 AND FS 265 IAW CRJ 900 SRM 51-40-11-001-001-A01. INSTALLED NEW L/H INTERCOSTAL CC670-32179-3 AND R/H INTERCOSTAL CC670-32179-4 AT BL 0 BETWEEN FS 280 AND FS 265 IAW CRJ 900 SRM 51-42-06-001-001-A01 AND 51-42-21-001-001-A01.