Service difficulty report · Beam · Boeing 7377H4

Difficulty date
February 10, 2023
Submitted
March 13, 2023
Operation
Air carrier
Aircraft
N277WN
Make and model
Boeing 7377H4
Aircraft serial
32531
Aircraft time
51,901 hours, 31,206 cycles
Part
Beam
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

MAIN CABIN FWD WET AREA CORROSION AT FLOOR BEAM UPPER SURFACE STA 328 RBL 14'<[01] REMOVED CORROSION MAIN CABIN FWD. WET AREA FLOOR BEAM UPPER SURFACE STA. 328 RBL.14'' PER. REF. SRM 53-10-51-1A-1;[02] VERIFIED STEP 1;[03] PERFORMED UT THICKNESS INSP. ON REWORKED AREAS IAW B737 NDT PART 4; 51-00-00; PROCEDURE 3. MIN. THICKNESS 0.120'<BR>TOOL: OLYMPUS 27MG B/C: 172139 DUE: 04/13/2023;[04] ORIGINAL MAT. .125' MAT. REMOVED .005' REMAINING MAT. .120 'FOUND WITHIN LIMITS AT FLOOR BEAM UPPER SURFACE PER. REF. SRM.53-10-51-1A-1 FIG. 105 DETAIL A-A;[05] STEP 3 ENTER IN ERROR.;[06] MECHANICALLY MEASURED REWORKED AREA OF BEAM UPPER FWD FLANGE: MATERIAL REMOVED: 0.018'; ORIG. MAT.: 0.125'; REMAINING MAT.; 0.107'; FOUND OUT OF LIMITS AS PER SRM 53-10-15-1A-1; FIG.103 DETAIL: 'C'.;[07] TOOL USED: ID: 410019; DUE DATE: 05/11/2023.;[08] THERE IS AN ADJACENT REWORKED AREA; 7.00' O/B; AT SAME FLOOR BEAM STA. 328; RBL 21; THAT ALSO IS OUT OF LIMITS. THE REPAIR WILL BE PERFORMED ON CARD: TTG8Q00HRY1G.;[09] VERIFIED STEPS 4; 6; 7; AND 8

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