# SDR 97ZZZM690

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 13, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Filed by: [Marana Aerospace Solutions Inc, repair station ERKR675D](https://openairdocs.org/faa-repair-station/ERKR675D/marana-aerospace-solutions-inc.md) (OpenAirDocs)
- Aircraft: N470EV
- Make and model: Boeing 747273C
- Aircraft serial: 20653
- System (JASC): [5315 · Fuselage Main, Floor Beam](https://openairdocs.org/jasc/5315)
- Part: Floorbeam
- Condition: Corroded
- Location: Bs 1450-1460
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZM690

## Discrepancy

DURING C-CHECK INSPECTION, DISCOVERED CORROSION ON THE UPPER SURFACE OF THE UPPER FLOORBEAM CHORD BETWEEN BS 1450-1460, RBL 57.7.  BLENDOUT OF CORROSION EXCEEDED SRM LIMITS AND REQUIRED TRIMMING TO REMOVE CORROSION.  REINFORCEMENT REPAIR ANGLES AND FILLERS WERE FABRICATED AND INSTALLED.  REPAIRED IAW EIAA, ENGINEERING CHANGE/REPAIR AUTHORIZATION NR 470-53-081-2.

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