# SDR CALA2018032100964

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 20, 2018
- Submitted: March 21, 2018
- Operation: Air carrier
- Aircraft: N568UA
- Make and model: Boeing 757222
- Aircraft serial: 26674
- Aircraft time: 81,729 hours, 27,521 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Floor Support
- Part number: 143N54101
- Condition: Corroded
- Location: Bs 720-740
- 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/CALA2018032100964

## Discrepancy

ON REMOVAL OF MAIN CABIN FLOOR BOX BEAM, DISCOVERED CORROISON ON THE ATTACHED SUPPORT CHANNEL BETWEEN BS 720 - 740, RBL 60 UPPER SURFACE.  BLENDED THE CORROSION AND FOUND TO BE OUT OF LIMITS IAW SRM 53-30-15, FIG 101, DETAIL IV,  ALLOWABLE DAMAGE I.   REPLACED THE SUPPORT CHANNEL IAW SRM 51-40-02, AND DWG 143N5410.

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