# SDR SWAA2021102824753

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 29, 2021
- Submitted: October 28, 2021
- Operation: Air carrier
- Aircraft: [N7831B](https://openairdocs.org/aircraft/N7831B), registered now
- Make and model: Boeing 737-7CT
- Registry model: [Boeing 737-7CT](https://openairdocs.org/model/boeing-737-7ct) (OpenAirDocs)
- Aircraft serial: 32752
- Aircraft time: 58,334 hours, 29,483 cycles
- System (JASC): [5340 · Fuselage Main, Attach Fittings](https://openairdocs.org/jasc/5340)
- Part: Flange
- 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/SWAA2021102824753

## Discrepancy

RT ECS EXHAUST O/B FLANGE HAS FRETTING CORROSION.  BLENDED OUT CORROSION AND MEASURED MINIMUM THICKNESS REMAINING. FOUND OUT OF LIMITS IAW SRM 53-40-71-1A-1, FIG 103, DETAIL C; VIEW A-A. ORIGINAL THICKNESS 0.100'; REMOVED 0.019'; REMAINING 0.081'.   REMOVED RT ECS EXHAUST PANEL AND WTB PANEL 192JR FOR ACCESS IAW AMM 53-51-21-000-802.  REMOVED CORRODED SUPPORT ANGLE IAW SRM 51-40-02-0G-0.  LOCATED & DRILLED FASTENER HOLES IAW SRM 51-40-05-0G-0. TREATED & PRIMED NEW SUPPORT ANGLE IAW AMM 51-21-41-370-801 & 51-21-72-370-804.  INSTALLED. NEW SUPPORT REMOVED EN SPTET 2 IAW SRM 51-40-02.  INSTALLED PANEL  192JR REMOVED STEP 2 IAW SRM. 51-40-02-0G-0.  INSTALLED RT ECS EXHAUST PANEL & PANEL192JR IAW SRM 51-40-02-0G-0.

---
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.