Service difficulty report · Rib · Boeing 7377H4

Difficulty date
June 20, 2024
Submitted
July 18, 2024
Operation
Air carrier
Aircraft
N476WN
Make and model
Boeing 7377H4
Aircraft serial
32475
Aircraft time
66,646 hours, 39,887 cycles
Part
Rib
Condition
Cracked
Location
Zone 300
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

RH HORIZONTAL LEADING EDGE PANEL 341B RIB #6 FOUND CRACKED.<[01] ***SUMMARY**<BR>REMOVED RIGHT HORIZONTAL STABILIZER L/E #6 RIB AS PER B 737 SRM 51-40-02-0G-0.<BR>LOCATED AND DRILLED NEW RIB AS PER B 737 SRM 51-40-05-0G-0.<BR>INSTALLED RH HORIZONTAL LEADING EDGE RIB #6 AS PER B-737 SRM 51-40-02-0G-0 & DWG 186A1306.<BR>MIXED SEALANT 0870B002BM<BR>10:00 PM 06/25/24<BR>SQUEEZE OUT TIME 12:00 AM @ 06/26/24;[02] VOID ENTRY STEP #1. SUMMARY STEP WAS WRITTEN IN ERROR.;[03] VERIFIED STEP 2. VOID STEP.;[04] ***SUMMARY**<BR>REMOVED RIGHT HORIZONTAL STABILIZER L/E #6 RIB AS PER B 737 SRM 51-40-02-0G-0.<BR>LOCATED AND DRILLED NEW RIB AS PER B 737 SRM 51-40-05-0G-0.<BR>INSTALLED FIRST OVER SIZE FASTENER AT 4TH EXISTING HOLE FROM TOP.<BR>INSTALLED RH HORIZONTAL LEADING-EDGE RIB #6 AS PER B-737 SRM 51-40-02-0G-0 & DWG 186A1306 & DWG 186A101.<BR>MIXED SEALANT 0870B002BM<BR>10:00 PM 06/25/24<BR>SQUEEZE OUT TIME 12:00 AM @ 06/26/24;[05] CORRECTION FOR SUMMARY TO READ REMOVED RIGHT HORIZONTAL STABILIZER L/E #6 RIB AS PER B 737 SRM 51-40-02-0G-0.<BR>LOCATED AND DRILLED NEW RIB AS PER B 737 SRM 51-40-05-0G-0.<BR>INSTALLED FIRST OVER SIZE FASTENER AT 4TH EXISTING HOLE FROM TOP PER SRM 51-40-05-0G-0.SRM 51-40-02-0G-0.<BR>INSTALLED RH HORIZONTAL LEADING-EDGE RIB #6 AS PER B-737 SRM 51-40-02-0G-0 & DWG 186A1306 & DWG 186A1001<BR>MIXED SEALANT 0870B002BM<BR>10:00 PM 06/25/24;[06] RII--VERIFIED STEP 5.

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