Service difficulty report · Intercostal · Boeing 7377H4

Difficulty date
April 25, 2023
Submitted
May 25, 2023
Operation
Air carrier
Aircraft
N959WN
Make and model
Boeing 7377H4
Aircraft serial
36674
Aircraft time
38,285 hours, 23,370 cycles
Part
Intercostal
Condition
Cracked
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

CRACK IN INTERCOSTAL FASTENER HOLE; BS 312+5; RBL 26; WL 208.<[01] AFTER FURTHER INVESTIGATION FOUND CRACK IN INTERCOSTAL FASTENER HOLE BS312+5 RBL 26 WL208 TO BE LOCATED AT BS312+5 RBL 31; WL 208.1;[02] REMOVED INTERCOSTAL FROM BS312-BS328 RBL 31 IAW SRM 51-40-02;[03] VERIFIED CORRECTIVE ACTION 1 AND 2.;[04] LOCATED AND DRILLED NEW INTERCOSTAL PN#141A5410U12 FROM BS312-BS328 RBL 31 IAW SRM 51-40-05 AND IAW DWG#141A5400. OK TO INSTALL;[05] VERIFIED CORRECTION ACTION ITEM 4 AND OK TO INSTALL GIVEN.;[06] INSTALLED INTERCOSTAL PN#141A5410U12 FROM BS312-BS328 RBL 31; WL 208.1 IAW SRM 51-40-05 AND IAW DWG#141A5400.;[07] VERIFIED CORRECTIVE ACTION 6 INSTALLATION;[08] UPDATED MEASUREMENT TABLE...JOB COMPLETED;[09] TASK IS COMPLETE.;[10] VERIFIED MEASUREMENT TABLE.

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