# SDR 97ZZZM691

- 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): [5730 · Wing, Plate/Skin](https://openairdocs.org/jasc/5730)
- Part: Skin
- Condition: Corroded
- Location: Bs 1050
- Part time: 70,088 hours
- 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/97ZZZM691

## Discrepancy

DURING C-CHECK INSPECTION, DISCOVERED EXFOLIATION CORROSION ON THE WING CENTER SECTION UPPER PANEL NR 1 EXTERNAL SKIN SURFACE.  THE CORRODED AREA IS LOCATED AT BS 1050 BETWEEN LBL 88.52 AND 98.52 AND EXTENDS ALONG STRINGER 27L.  REPAIRED BY BLENDING AWAY CORROSION IN THE AFFECTED AREAS.  REPAIRED IAW WITH EIAA, ENGINEERING CHANGE/REPAIR AUTHORIZATION NR 470-57-088-2.  (M)

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