Service difficulty report · Stringer · Boeing 73776N

Difficulty date
February 3, 2023
Submitted
March 6, 2023
Operation
Air carrier
Aircraft
N7885A
Make and model
Boeing 73776N
Aircraft serial
33379
Aircraft time
62,518 hours, 31,343 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-25R WL156. MARKED<[01] UPDATE PARTIAL STEPS 1-3;[02] SRM 53-00-03-2R-1 REPAIR 1 IS APPLICABLE TO THIS A/C AND REPIR.;[03] PERFORMED CUT OUT ON S-25R FCB; REMOVED DAMAGE PART FROM BS 500D+10 TO BS 540 IAW SRM 53-00-03-2R-1 REPAIR 1;[04] VERIFIED CORRECTIVE ACTION 2 AND 3.;[05] REQ NDI CUT OUT FOR FREE CRACK CONDITION AND INSPECTION THAT ALL OF THE DAMAGE IS REMOVED IAW SRM 53-00-03-2R-1 REPAIR 1;[06] ACCOMPLISHED HFEC SURFACE SCAN IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 23. NO CRACKS NOTED.<BR><BR>EQUIPMENT USED: NORTEC 600 ID: ATS1465 CAL DUE: 09/2023;[07] INSTALLED ALL REPAIR PARTS AT STR 25R BETWEEN BS 500D AND BS 540 IAW SRM 53-00-03-2R-1 REPAIR 1 AND ER 23-153-00433-WIP1;[08] VERIFIED STEPS 1-3; THE MEASUREMENT TABLE AND CORRECTIVE ACTION 7;[09] VERIFIED RII INSPECTION REQUIREMENTS ARE MET.;[10] STRINGER STR25R BS510-540 IS A CATEGORY B REPAIR WITH A REINSPECTION THRESHOLD AT 50K AIRCRAFT CYCLES AND 2350 CYCLES THEREAFTER.;[11] 'THE DAMAGE WAS REPAIRED PER 737-700 SRM 53-00-03-2R-1 (REPAIR 1) AND EA 23-153-00433. THIS IS A CATEGORY A REPAIR; AND NO SUPPLEMENTAL INSPECTIONS ARE REQUIRED.';[12] VERIFIED CORRECTIVE ACTION #11

More about the Boeing 737-76N