Service difficulty report · Stringer · Boeing 7377Q8

Difficulty date
June 3, 2022
Submitted
June 30, 2022
Operation
Air carrier
Aircraft
N7850B
Make and model
Boeing 7377Q8
Aircraft serial
28238
Aircraft time
59,194 hours, 39,098 cycles
Part
Stringer
Condition
Cracked
Location
Fuselage
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 ON FWD CARGO BAY BS 540 L/H STRINGER 23. / [01] EVALUATED CRACK AT STRINGER 23 L/H B/S 540 STRINGER FOUND OUT OF LIMIT IAW SRM 53-00-03-1A-1 PARAGRAPH 4A(2)(A)1;[02] REMOVED FASTENERS BTW B/S 500D TO B/S 540 AND REMOVED DAMAGE BY TRIMMING OUT STRINGER SECTION BTW B/S 500D-520 STR 23L/H IAW SRM 51-10-02;[03] PARTIAL UPDATE STEP #1;[04] PARTIAL ; UPDATE STEP #2;[05] CERTIFIED PARTIAL STEP 2.;[06] UPDATE CORRECTIVE ACTION #2:REMOVED FASTENERS BTW B/S 500D TO B/S 540 AND CUT AND REMOVED STRINGER SECTION AT B/S 500D+10' TO B/S 540 23L/H IAW SRM 51-10-02;[07] UPDATED PARTIAL WORK FOR STEP 2 AND VERIFIED CORRECTIVE ACTIONS 1; 4; AND 6.;[08] COMPLETED STEP 3.;[09] STEP 3 COMPLETE;[10] FABRICATED OF THE STRINGER SECTION USING BAC5602 T62 7075 T 0.036' ITEM:HFAB53-STR-011 LOT: 1493964-1 AND HAT SECTION USING BAC5602 T6 7075T 0.040 ITEM:HFAB53-HS-011 LOT: 1493918-1 IAW SRM 53-00-03-2R-1 REPAIR 1 4.D-I;[11] FABRICATED OF THE STRINGER SECTION USING BAC5602 T62 7075 T 0.036' ITEM:HFAB53-STR-011 LOT: 1493964-1 AND HAT SECTION USING BAC5602 T6 7075T 0.040 ITEM:HFAB53-HS-011 LOT: 1493918-1 IAW SRM 53-00-03-2R-1 REPAIR 1 4.D-I;[21] INSTALLED REPAIR PATS AT STR 23L BS500D TO BS540 IAW IAW SRM 53-00-03-2R-1; EANO:22-153-01693 REV:A; BOEING DWG 143A0060 REV:- AND BOEING DWG 143A3210 REV:-;

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