Service difficulty report · Sidewall Support · Boeing 7377CT

Difficulty date
October 13, 2022
Submitted
November 17, 2022
Operation
Air carrier
Aircraft
N569WN
Make and model
Boeing 7377CT
Aircraft serial
33656
Aircraft time
66,340 hours, 34,395 cycles
Part
Sidewall Support
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 FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL 24 BS 400+2; BS 420+17; BS 440+14; BS 460+6; BS 460+18. / [01] VERIFIED APPLICABILITY FOR ALLOWABLE DAMAGE LIMITS SRM 53-00-53-1A-2.;[02] REMOVED CORROSION ON FCB FLOOR TO SIDEWALL SUPPORT AT LBL24;BS420+17.MEASURES:L=1.00;W=.7;D=.015';ORIGINAL MATERIAL TICKNESS IS 0.040';REMAINING TICKNESS:0.025';FOUND TO BE OUT LIMITS;IAW SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2;PARAG. 4A(2) DETAIL D FIG.103 AND SRM 53-30-53-0I-2 IDENTIFICATION 2 TABLE 2.TOOL USED ATS:2677;S/N UNKNOWN;DUE:11/2022.;[03] COMPLETED STEPS #1-2-3-4-5.;[04] VERIFIED CORRECTIVE ACTION STEPS 1;2 AND 3.;[05] FABRICATED LOCATED AND DRILLED NEW FLOOR TO SIDEWALL SUPPORT FROM BS 400 TO BS 500D LBL 24<BR>AND SPLICE PER SRM 51-40-05-0G-0; SRM 53-00-53-2R-5 AND DWG 143A7501; MATERIAL USED BAC1496-444#7075T62 LOT: 1506362-1 OK TO TREAT AND PRIME NEW FLOOR TO SIDEWALL AND NEW SPLICE;[09] INSTALLED SPLICE REPAIR ON SIDEWALL SUPPORT BS 480+10 IAW SRM 53-00-53-2R-5 <BR>THE SIDEWALL SUPPORT WILL BE INSTALLED WITH ID.;[12] INSTALLED SPLICE REPAIR ON SIDEWALL SUPPORT BS 480+10 IAW SRM 53-00-53-2R-5<BR>THE SIDEWALL SUPPORT WILL BE INSTALLED WITH ID: TTG8Q004B2CN

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