# SDR 95UAL900238

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 30, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N174UA
- Make and model: Boeing 747422
- Aircraft serial: 24381
- Engine: Pwa PW4056
- System (JASC): [2781 · Leading Edge Slat Position Indicating System](https://openairdocs.org/jasc/2781)
- Part: Switch Assy
- Part number: 9752844
- Condition: Malfunctioned
- Location: Le Flaps
- Stage of operation: CL
- Nature of condition: N
- Precautionary procedure: J, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95UAL900238

## Discrepancy

AIRCRAFT EXPERIENCED INTERMITTENT -FLAPS PRIMARY+ AND -FLAPS DRIVE+ MESSAGES IN-FLIGHT SOON AFTER TAKE-OFF.  FLIGHT CREW ELECTED TO DUMP FUEL AND RETURN TO FIELD.  THE L1 LEADING EDGE FLAP DRIVE UNIT POSITION SWITCH ASSEMBLY WAS REPLACED WITH AN IMPROVED P/N SWITCH.  THE OLD SWITCH HAS BEEN KNOWN TO CAUSE NUISANCE EICAS MESSAGES.

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