Service difficulty report · Intercostal · Boeing 737

Difficulty date
August 12, 2022
Submitted
September 7, 2022
Operation
Air carrier
Aircraft
N8648A
Make and model
Boeing 737
Aircraft serial
42531
Aircraft time
27,511 hours, 12,724 cycles
Part
Intercostal
Part number
141A5410U24
Condition
Cracked
Location
Fwd Wet Area
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

CRACKED INTERCOSTAL AT FWD WET AREA BS344+9 RBL12. / [01] REQUEST NDI TO VERIFY CRACK FREE CONDITION ON INTERCOSTAL AT FWD WET AREA BS344+9 RBL12.;[02] HFEC INSPECTED OPEN HOLES IAW 737 NDTM PART 6 51-00-00 PROCEDURE 16. <BR>NO CRACKS NOTED. <BR>EQUIP USED: <BR>-NORTEC 600 ID: ATS2353 CAL DUE: 01/23 <BR>-MINIMITE ID: ATS1411 CAL DUE: 07/23;[03] UPON FURTHER INVESTIGATION INTERCOSTAL AT FWD WET AREA BS344+9 RBL12 WL 208 WAS FOUND TO BE IN CRACK FREE CONDITION.;[04] HFEC INSPECTED SURFACE AREA IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23.<BR>2 CRACKS NOTED; BOTH ARE 0.6'. ONE ADJACENT TO THE FWD FASTENER HOLE; AND ONE ADJACENT TO THE AFT FASTENER HOLE. MARKED ENDS OF CRACKS.<BR>EQUIP USED:<BR>-NORTEC 600 ID: ATS2353 CAL DUE: 01/23;[05] UPDATED MEASUREMENT TABLE.;[06] REMOVED INTERCOSTAL AT FWD WET AREA BS344+9 RBL12 WL 208 PER SRM 51-40-02.;[07] LOCATED AND DRILLED NEW INTERCOSTAL AT FWD WET AREA BS344+9 RBL12 WL 208 PER SRM 51-40-05; DWG#141A5400. AND REQUEST OK TO INSTALL.;[08] INADVERTENTLY UPDATED INSPECTORS LABOR ROW. (CORRECTIVE ACTION 6.);[09] INADVERTENTLY UPDATED INSPECTORS LABOR ROW. (CORRECTIVE ACTION 7.);[10] REMOVED; LOCATED; AND DRILLED NEW INTERCOSTAL AT FWD WET AREA BS344+9 RBL12 WL 208 PER SRM 51-40-02; SRM 51-40-05; AND DWG#141A5400. REQUEST OK TO INSTALL.;[11] VERIFIED CORRECTIVE ACTION #10<BR>OK TO INSTALL GIVEN;[12] INSTALLED NEW INTERCOSTAL AT FWD WET AREA BS344+9 RBL12 WL 208 PER SRM 51-40-02; DWG#141A5400