Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
July 6, 2023
Submitted
August 15, 2023
Operation
Air carrier
Aircraft
N229WN
Make and model
Boeing 7377H4
Aircraft serial
32498
Aircraft time
58,665 hours, 35,024 cycles
Part
Floorbeam
Part number
UNKNOWN
Condition
Corroded
Location
Zn 200 Fus Top
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 BS 986 FLOOR BEAM UPPER FLANGE RBL 40-44 AND LBL 44 WL 208.<[01] UPDATED STEPS 1-10.;[02] PARTIAL STEP 11-13;[03] VERIFIED THE APPLICABILITY OF SRM 53-70-51-1A-1;[04] EVALUATED CORROSION ON BS 986 UPPER FWD FLANGE AT LBL 44; AREA 1'X1.2'X0.036'; AT RBL 44; AREA 1'X1'X0.042'; AREA FOUND TO BE OUT OF LIMITS IAW SRM 53-70-51-1A-1; PAR 4.D(2) FIG 103; DETAIL E; TOOL USED ID:ATS1225; DUE 08/2023;[05] REMOVED DAMAGED FLOOR BEAM UPPER FLANGE AT BS 986; RBL53-LBL53 IAW SRM 53-70-51-2R-4RECEIVED NEW L/H AND R/H -8 CORNER FITTINGS MACHINED PENETRANT INSPECTED AND SHOT PEENED AT MACHINE SHOP ON CUSTOMER R/O # 928408-SWA AND R/O # 928411-SWA MATERIAL USED 7050T7451 LOT#1483248-1 ; FABRICATED (4EA) -6 FILLERS FROM 7075T6 # 0.020' CLAD LOT # 1503264-1 FOR BS 986 FLOOR BEAM AFT INTERCOSTALS RBL 7.5 AND RBL 44 ; LOCATED AN

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