Service difficulty report · Floorbeam · Boeing 7378H4

Difficulty date
October 22, 2023
Submitted
November 30, 2023
Operation
Air carrier
Aircraft
N8553W
Make and model
Boeing 7378H4
Aircraft serial
63601
Aircraft time
19,705 hours, 9,889 cycles
Part
Floorbeam
Part number
UNKNOWN
Condition
Corroded
Location
Zn 100 Fus Lower
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

CORROSION ON FLOOR BEAM AT FASTENER HOLE 986.5 LBL 43<[01] BLENDED CORROSION ON UPPER FLANGE OF FLOOR BEAM 986.5 AT LBL 43? PER SRM 51-10-02. REMOVED .016? OF MATERIAL. REMAINING THICKNESS IS .134?. DAMAGE REMOVAL IS OUT OF LIMITS PER SRM 53-70-51-1A-1.;[02] VERIFIED CORRECTIVE ACTION #1.;[03] REMOVED DAMAGED PORTION OF FLOOR BEAM PER SRM 53-70-51-2R-6; ALTERNATIVE 4.;[04] ACCOMPLISHED HFEC SURFACE AND HOLE PROBE INSPECTION PER NDT PART 6 51-00-00 PROC. 23 AND 51-00-00 PROC. 16;[05] FLAP PEENED CUT EDGE PER SRM 53-70-51-2R-6.;[06] C/W INSPECTION OF CORRECTIVE ACTION #5;[07] PERFORMED DETAILED VISUAL INSPECTION OF REPAIR AREA AND ADJACENT STRUCTURE PER SRM 53-70-51-2R-6. NO DEFECTS NOTED.;[08] FABRICATED AND DRILLED REPAIR PARTS PER SRM 53-70-51-2R-6; ALTERNATIVE 4.;[09] VERIFIED CORRECTIVE ACTION #8. OK TO TREAT AND PRIME.;[10] ALODINED AND PRIMED REPAIR PARTS AND REWORK AREA PER SRM 51-20-01 AND SOPM 20-41-02.;[11] VERIFIED CORRECTIVE ACTION #10.;[12] OK TO INSTALL REPAIR.;[13] INSTALLED REPAIR PARTS WET; SEALED; AND PAINTED REPAIR PER SRM 53-70-51-2R-6; ALTERNATIVE 6.;[14] VERIFIED CORRECTIVE ACTION #13. RII INSPECTION C/W.

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