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 AT AFT HOLE ON INTERCOSTAL; BS 344-360; LBL 6; WL 208.<[01] AFTER FURTHER INVESTIGATION FOUND CRACK AT AFT HOLE ON INTERCOSTAL BS344-BS360 LBL 6 WL208 TO BE LOCATED AT AFT HOLE ON INTERCOSTAL BS344+9.5 LBL11; WL 208.1;[02] REMOVED INTERCOSTAL FROM BS344-BS360 LBL11 IAW SRM 51-40-02;[03] VERIFIED CORRECTIVE ACTION 1 AND 2.;[04] LOCATED AND DRILLED NEW INTERCOSTAL P/N#141A5410U148 FROM BS344-BS360 LBL11 IAW SRM 51-40-02 AND PER DWG#141A5400. OK TO INSTALL;[05] VERIFIED CORRECTIVE ACTION 4. OK TO INSTALL;[06] INSTALLED NEW INTERCOSTAL P/N#141A5410U148 FROM BS344-BS360 LBL11 IAW SRM 51-40-02 AND PER DWG#141A5400.;[07] RII;VERIFIED CORRECTIVE ACTION 6.;[08] TASK IS COMPLETE.

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