Service difficulty report · Stringer · Boeing 73776Q

Difficulty date
April 14, 2023
Submitted
May 9, 2023
Operation
Air carrier
Aircraft
N551WN
Make and model
Boeing 73776Q
Aircraft serial
30280
Aircraft time
66,624 hours, 41,198 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 STRINGER AT AREA AFT OF FWD CARGO BAY BS535 S-26R WL153. MARKED<[01] CRACKED STRINGER AT AREA AFT OF FWD CARGO BAY BS535 S-26R WL153 FOUND TO BE OUT OF LIMITS DUE TO CRACKS ARE NOT ALLOWED IAW SRM 53-00-03-1A-1 .<BR>CUT AND REMOVED THE DAMAGED PART OF STR 26R BETWEEN BS 500D +11 AND BS 540 IAW SRM 53-00-03-2R-1 REPAIR 1;[02] VERIFIED CORRECTIVE ACTION 1 AND THE MEASUREMENT TABLE.;[03] REQUEST NDI TO DO A HIGH FREQUENCY EDDY CURRENT (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] HFEC INSPECTED CUTOUT AREA IAW 737 NDTM PART 6 51-00-00 PROCEDURE 23.<BR>NO CRACKS NOTED.<BR>EQUIP USED:<BR>-NORTEC 600 ID: ATS1465 CAL DUE: 09/23;[05] UPDATED STEPS 1 AND 2;[06] RECIVED FROM OSS STRIGER SECTION 26R FROM MATERIAL 7075T0#0.045' CLAD TO 7075T6 CONDITION LOT# 1525204-1 CUSTOMER RO NO 915427-SWA; AND HAT CHANNEL FROM MATERIAL 7075T0#0.050' CLAD TO 7075T6 CONDITION LOT# 1525263-1 CUSTOMER RO NO 915439-SWA IAW SRM 53-00-03-2R-1 REPAIR 1;[07] FABRICATED -7 STRINGER SECTION 26R FROM MATERIA 7075T6#0.045' LOT# 1525204-1; -1 HAT SECTION CHANNEL FROM MATERIAL 7075T6#0.050' LOT# 1525263-1 LOCATED AND DRILLED REPAIR PARTS AND APPLIED CHEMICAL CONVERSION COATING IAW SRM 53-00-03-2R-1 REPAIR 1; OK TO PRIMER;[11] INSTALLED REPAIR PARTS; STRINGER SECTION 26R BS 500D+10 TO BS 540 AND HAT SECTION CHANNEL AT BS 500D+10 IAW SRM 53-00-03-2R-1 REPAIR 1

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