What was found
PDX: LT OUTBOARD FLAP, INBOARD END, CHAFED 15.5 INCHES FWD OF TRAILING EDGE. MAINTENANCE REPAIRED IAW Q400 SRM 51-26-10, SRM 51-42-05, SRM 57-52-30-320-801, Q400 NDTM PART 1, 51-00-04, NDTM PART 6, 51-00-01-250-801 AND HORIZON EA 6-57-490.