What was found
'NO FLIGHT', FOUND DURING 'HEAVY 2 MAINTENANCE CHECK' AT TIMCO HEAVY MAINTENANCE FACILITY (OSCODA MI). FLOOR BEAM UPPER CHORD AFT FLANGE CORRODED AND CRACKED AT FASTENER HOLE. (BS 950F, RBL 62.0). REMOVED DAMAGED AREA IAW B 727 SRM 53-10-8. FABRICATED DOUBLERS PER B 727 SRM 51-10-2. INSTALLED REPAIR IAW B 727 SRM 53-10-8 AND EDR B2-07313. AIRCRAFT RETURNED TO SERVICE. (X)