# SDR 2001FA0000278

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2001
- Submitted: September 14, 2001
- Operation: General aviation
- Make and model: Boeing 727
- Registry model: [Boeing 727](https://openairdocs.org/model/boeing-727) (OpenAirDocs)
- System (JASC): [2730 · Elevator Control System](https://openairdocs.org/jasc/2730)
- Part: Housing
- Part number: 401606223
- Condition: Corroded
- Location: Seal Plate
- Component: Computer, Moog
- Component part number: 4016027201
- 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/2001FA0000278

## Discrepancy

HOUSING ASSEMBLY IS CORRODED ON THE SEAL PLATE SURFACE, IN THE CHECK VALVE PORTS AND BOLT HOLES.  HOUSING ASSEMBLY IS MADE FROM MAGNESIUM ALLOY AND IS EXTREMELY SUSCEPTIBLE TO DISSIMILAR METAL CORROSION AND CRACKS.

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