Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
July 22, 2022
Submitted
August 22, 2022
Operation
Air carrier
Aircraft
N490WN
Make and model
Boeing 7377H4
Aircraft serial
32476
Aircraft time
59,880 hours, 35,571 cycles
Part
Floorbeam
Condition
Corroded
Location
Cabin Floor
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 FLOORBEAM AT AFT CABIN BS986 RBL5; LBL5. MARKED. / [01] REMOVED CORROSION FROM PASSENGER CABIN FLOOR BEAM BS 986 RBL 5; WL 208 IN AREA OF 1' X 1' X 0.08' DEEP ORIGINAL MATERIAL THICKNESS 0.150' FOUND TO BE OUT OF LIMIT IAW SRM 53-70-51-1A-1 DET. 4H; FIG 103-C TOOLS USED MICROMETER ID: ATS1671; S/N:65093024; DUE10/2022;[02] VERIFIED APPLICABILITY OF SRM 53-70-51-01-1 FOR IDENTIFICATION AND SRM 53-70-51-1A-1 FOR ALLOWABLE LIMIT;[03] PARTIALLY COMPLETED STEP 1 & 2;[04] VERIFIED CORRECTIVE ACTION 1; 2 COMPLETED AND PARTIAL FOR CORRECTIVE ACTION 3;[05] 'REFER TO FAULT TTG8Q00DQKNA WHERE EA 22-153-02234 WAS ADDED AS A SUBTASK. 'FAULT RESOLVED ON OTHER FAULT' REPAIR REFERENCE IS SELECTED.;[06] VERIFIED CORRECTIVE ACTION 5;[07] COMPLETED STEPS 1 AND 2;[08] UPDATED STEP 1AND 2 AS A PARTIAL STEP;[09] VERIFIED CORRECTIVE ACTION 5;6;7 COMPLETED

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