Service difficulty report · Stringer · Boeing 7377H4

Difficulty date
April 26, 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
Stringer
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

CRACKED STR IN AREA AFT OF FWD CARGO BAY; STR 24R; BS 535; WL 162.<[01] VERIFIED THE APPLICABILITY OF SRM 53-30-03-0I-1 ; SRM 53-00-03-1A-1 ; AND SRM 53-00-03-2R-1 REPAIR 1;[02] CUT AND REMOVED THE DAMAGED SECTION OF STRINGER 24R BETWEEN BS 500D+11' AND BS 540 IAW SRM 53-00-03-2R-1 REPAIR 1;[03] REQUEST NDI TO DO HFEC INSPECTION OF THE REPAIR AREA TO MAKE SURE THAT ALL OF THE DAMAGE IS REMOVED. REFER TO 737 NDT PART 6; 51-00-00; FIGURE 4;[04] VERIFIED CORRECTIVE ACTION 1 AND 2.;[05] NDT HFEC INSPECTED SURFACE AND EDGES PER 737 NDTM PART 6; 51-00-00; PROC 23 (FIG 4); NO CRACKS NOTED.<BR>EQUIP ID ATS1465 DUE 09/23;[06] UPDATE STEP 2;[07] RECEIVED NEW REPLACEMENT STRINGER FROM MACHINE SHOP FORMED 1EA HFAB53-STR-011; LOT#1526117-1;7075T0#0.063'CLAD HEAT TREATED TO T62 PER BAC 5602 AND DYE PENETRANT INSPECTED PER BAC5423; CUSTOMER RO#917019-SWA; AND HAT SECTION MADE FROM 69-78188-6; BOTH ANGLES LOCATED AND DRILLED AT BS 500D+8 - BS 538 STR 24R IAW SRM 53-00-03-2R-1 OK TO TREAT AND PRIME THE REPAIR PARTS AND CUT OUT.;

More about the Boeing 737-7H4