# SDR SWAA2023012786242

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 29, 2022
- Submitted: January 27, 2023
- Operation: Air carrier
- Aircraft: N7812G
- Make and model: Boeing 737-76N
- Registry model: [Boeing 737-76N](https://openairdocs.org/model/boeing-737-76n) (OpenAirDocs)
- Aircraft serial: 32582
- Aircraft time: 56,870 hours, 33,864 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Intercostal
- Condition: Corroded
- Location: Zone 100
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2023012786242

## Discrepancy

CORROSION ON INTERCOSTAL AT AFT CARGO BAY BS807+13 RBL6.<[01] EVALUATED CORROSION AT ALL LOCATIONS; FOUND DEEPEST LOCATION TO BE AT BS 807+13' REMOVED 0.0006' IN AN AREA OF 1'X1' ORIGINAL THICKNESS 0.036' FOUND TO BE OUT OF LIMITS PER SRM 53-00-04-1A-1 USING ATS TOOL ID ATS2678 EXP 4/2023;[02] REMOVED INTERCOSTAL PER SRM 51-40-02;[03] VERIFIED CORRECTIVE ACTION 1 AND MEASUREMENT TABLE.;[04] RECEIVED INTERCOSTAL BS 807 TO BS 827 RBL 6 FROM OSS; CUSTOMER RO# 899581-SWA; MATERIAL USED 7075 T0 .063' CLAD LOT# 1392320-1;[05] LOCATED AND DRILLED NEW INTERCOSTAL BS 807 TO BS 827 RBL 6 PER SRM 51-40-05-0G-0 AND DWG 146A8130. OK TO APPLY CHEMICAL CONVERSION COATING AND PRIMER;[06] VERIFIED CORRECTIVE ACTIONS 4 AND 5.;[07] APPLIED CHEMICAL CONVERSION COATING AND PRIMER ON INTERCOSTAL BS 807 TO BS 827 RBL 6 PER SRM 51-20-01 AND SOPM 20-41-02.;[08] OK TO INSTALL INTERCOSTAL;[09] VERIFIED CORRECTIVE ACTION 8.;[10] INSTALLED INTERCOSTAL AT BS 807 TO BS 827 RBL 6 PER SRM 51-40-02-0G-0 AND DWG 146A8130;[11] VERIFIED CORRECTIVE ACTION 10 AND MEASUREMENT TABLE.

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