Service difficulty report · Support · Boeing 7377H4

Difficulty date
March 16, 2023
Submitted
April 24, 2023
Operation
Air carrier
Aircraft
N957WN
Make and model
Boeing 7377H4
Aircraft serial
41528
Aircraft time
38,518 hours, 23,626 cycles
Part
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

MULTIPLE AREA OF CORROSION ON FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT AT LBL 24 BS 400-480+10 WL 156.<[01] VERIFIED APPLICABILITY OF SRM 53-00-53-1A-2 ALLOWABLE DAMAGE 2<BR><BR>REMOVED CORROSION ON FCB FLOOR TO SIDEWALL SUPPORT AT BS460+10'; RBL24; WL156. AREA REMOVED W:1' X L:1' D:0.015' ORIGINAL THICKNESS 0.040'; REMAINING THICKNESS 0.025' FOUND TO BE OUT OF LIMITS DUE TO FASTENER PROXIMITY TO BLEND PER SRM 53-00-53-1A-2 FIG103. DETAIL E. <BR>TOOL: ID:ATS1225 <BR>S/N UNKNOWN <BR>DUE DATE: 08/2023;[02] VERIFIED CORRECTIVE ACTION 1.;[03] STARTED TO LOCATE AND DRILL NEW FCB FLOOR TO SIDEWALL SUPPORT PER SRM 51-40-05<BR>EXTRUSION BAC1496-444#7075T62. LOT# 1520195-1;[04] LOCATED AND DRILLED NEW FCB FLOOR TO SIDEWALL SUPPORT AT BS400 - BS480+10; LBL24; WL156 USING BAC1496-444#7075T62 LOT# 1520195-1 PER SRM 53-00-53-2R-6 FIG 202 AND DWG 143A7500;[05] APPLIED CHEMICAL CONVERSION COATING TO FLOOR TO SIDEWALL SUPPORT PER AMM 51-21-41-370-802. OK TO PRIMER;[06] APPLIED PRIMER ON FWD CARGO BAY FLOOR TO SIDEWALL SUPPOR AND SPLICE AT BS 396 TO BS 500D LBL 24 WL 156 IAW SRM 51-21-72-370-804(ACCOMPLISHED ON CUSTOMER CARD TTG8Q00JWFZF);[07] UPDATED MEASUREMENT TABLE ITEM 9 AND 10 TO REFLECT LBL;[08] VERIFIED CORRECTIVE ACTION ITEMS 3; 4; 5; 6.<BR>VERIFIED MEASUREMENT TABLE COMPLETED.;[09] VERIFIED WORK COMPLETED FOR THIS FAULT (PART FABRICATED).;[10] VERIFIED WORK COMPLETED FOR THIS FAULT (PART FABRICATED).

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