# SDR ASAA2015031811172

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 18, 2015
- Submitted: April 1, 2015
- Operation: Air carrier
- Aircraft: [N644AS](https://openairdocs.org/aircraft/N644AS), registered now
- Make and model: Boeing 737790
- Aircraft serial: 30795
- Aircraft time: 41,429 hours, 18,542 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Web
- Part number: 143A812210
- Condition: Corroded
- Location: Bs 440-492
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2015031811172

## Discrepancy

FWD CARGO COMPARTMENT, LOWER SILL WEB IS CORRODED ON LOWER SURFACE. ACFT GROUNDED.  REMOVED CORROSION AND FOUND BEYOND ALLOWABLE LIMITS IAW SRM 53-30-15-1A-1, FIG 103.  ORIGINAL MATERIAL THICKNESS WAS 0.045" IAW SRM 53-30-15-0I-1, TABLE 4, MATERIAL THICKNESS REMOVED IS 0.005", MATERIAL THICKNESS REMAINING IS 0.040" MAX ALLOWABLE DEPTH IS 0.10" IAW SRM 53-30-15 1A-1, FIG 103.  REPLACED CORRODED WEB IAW SRM 
5-10-02, PARA 9 AND BAC DWG 143A8330, REV A 143A8120.

---
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.