# SDR SWAA2022041883769

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 14, 2022
- Submitted: April 18, 2022
- Operation: Air carrier
- Aircraft: [N7877H](https://openairdocs.org/aircraft/N7877H), registered now
- Make and model: Boeing 737-7Q8
- Registry model: [Boeing 737-7Q8](https://openairdocs.org/model/boeing-737-7q8) (OpenAirDocs)
- Aircraft serial: 29359
- Aircraft time: 50,381 hours, 27,028 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Channel
- Condition: Corroded
- Location: Fuselage
- 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/SWAA2022041883769

## Discrepancy

CORROSION ON MOP SILL AT B.S. 947 - 986.5; R.B.L. 53; W.L. 209. / [01] REMOVED CORROSION FROM AFT SERVICE DOOR MOP SILL BS 947-986.5 MAXIMUM MATERIAL REMOVED AT BS 959 IN AREA OF 5' X 1' AT ORIGINAL MATERIAL THICKNESS 0.080' REMAINING MATERIAL THICKNESS 0.068' FOUND TO BE OUT OF LIMIT IAW SRM 53-70-15-1A-1 <BR>TOOLS USED CALIPER ID ATS2503; S/N A19335646;[02] VERIFIED REMOVED CORROSION FROM AFT SERVICE DOOR MOP SILL BS 947-986.5 MAXIMUM MATERIAL REMOVED AT BS 959 IN AREA OF 5' X 1' AT ORIGINAL MATERIAL THICKNESS 0.080' REMAINING MATERIAL THICKNESS 0.068' FOUND TO BE OUT OF LIMIT IAW SRM 53-70-15-1A-1.;[03] REMOVED AFT SERVICE DOOR MOP SILL IAW SRM 51-40-02-0G-0.;[04] LOCATED AND DRILLED AFT SERVICE DOOR MOP SILL PER SRM 51-40-05-0G-0 AND DWG NO. 147A0000. DWG NO. 147A8501;[05] CORRECTION OF ACTION 4. LOCATED AND DRILLED AFT SERVICE DOOR MOP SILL PER SRM 51-40-05-0G-0 AND DWG NO. 147A0000. DWG NO. 147A8501.<BR>OK TO INSTALL AFT SERVICE DOOR MOP SILL.;[06] UPDATED PART REMOVED;[07] INSPECTED & VERIFIED CORRECTIVE ACTION ITEMS 5 & 6. OK TO INSTALL NEW ASD MOP SILL GIVEN.;[08] INSTALLED NEW AFT SERVICE DOOR MOP SILL BS 947-986.5 RBL 53 WL 208 I.A.W SRM 51-40-02-0G-0 AND DWG 147A8501.;[09] INSPECTED & VERIFIED CORRECTIVE ACTION ITEM 8.;[10] VERIFIED FAULT TTG8Q00BALZ8 IS COMPLETE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.