Service difficulty report · Floorbeam · Boeing 7378H4

Difficulty date
March 25, 2022
Submitted
April 20, 2022
Operation
Air carrier
Aircraft
N8628A
Make and model
Boeing 7378H4
Aircraft serial
42384
Aircraft time
27,196 hours, 12,448 cycles
Part
Floorbeam
Part number
141A55052
Condition
Corroded
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 344 FLOORBEAM FWD UPPER FLANGE AT RBL 1; WL 208. / [01] REMOVED CORROSION ON 344 FLOORBEAM; FWD UPPER FLANGE AT RBL 1; WL 208 PER SRM 51-10-02-0G-0. AREA BLENDED IS 1.7' BY 1.2' PER SRM 51-10-02-0G-0.;[02] VERIFIED CORRECTIVE ACTION STEP 1 TO BE COMPLETED;[03] UT THICKNESS TESTED BLENDED AREA PER 737NDT PART 4 51-00-00 PROCEDURE 2. LOWEST REMAINING THICKNESS IS .147' NEAR AFT EDGE OF HOLE. ADJACENT THICKNESS IS .175'.;[04] MAX MATERIAL REMOVED WAS .028' FROM .175'. OUT OF LIMITS PER SRM 53-10-51-1A-1>ACCOMPLISHED 10X INSPECTION OF REWORKED AREA AND DVI. NO OTHER FAULTS NOTED.;[08] LOCATED; DRILLED; AND TRIMMED -1 STRAP FROM .100' 7075T6 CLAD LOT# 1456801-1; AND APPLIED CHEMICAL CONVERSION COATING TO -1 STRAP AND BARE METAL IN REPAIR AREA PER SRM 53-10-51-2R-8.;[09] VERIFIED CORRECTIVE ACTION 8.;[10] PRIMED -1 STRAP AND BARE METAL IN REPAIR AREA PER SRM 53-10-51-2R-8. OK TO INSTALL REPAIR.;[11] INSTALLED REPAIR PER SRM 53-10-51-2R-8.;[12] VERIFIED CORRECTIVE ACTION 10. <BR><BR>OK TO INSTALL WAS GIVEN PRIOR TO INSTALLATION REPAIR INSTALLED. <BR><BR>FILL OF BLEND AREA STILL REQUIRED.;[14] FILLED BLEND AREA PER SRM 53-10-51-2R-8 STEP 4.L.;[15] VERIFIED CORRECTIVE ACTION 14. BLEND AREA FILLED.

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