# SDR AALA20020619

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 3, 2002
- Submitted: July 11, 2002
- Operation: Air carrier
- Aircraft: [N786AN](https://openairdocs.org/aircraft/N786AN), registered now
- Make and model: Boeing 777223
- Aircraft serial: 30250
- System (JASC): [2842 · Fuel Quantity Sensor](https://openairdocs.org/jasc/2842)
- Part: Computer
- Part number: UNI5457
- Condition: Faulty
- Location: Fuel System
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20020619

## Discrepancy

ORD - FLT 50 - APPROXIMATELY 45 MINUTES INTO THE FLIGHT THE FUEL GAUGE AND SYNOPTIC WENT BLANK FOR ABOUT 30 SECONDS.  APPROXIMATELY HALF AND HOUR LATER GOT A FUEL IMBALANCE EICAS MESSAGE AND RIGHT TANK DROPPED TO 34.5 WHILE THE LEFT TANK REMAINED AT 54.5.  THERE WAS NO EVIDENCE OF A LEAK AND AFTER APPROX 30 MINUTES THE RIGHT GAUGE GRADUALLY INCREASED BACK TO 54 AND FUNCTIONED NORMALLY.  T/S FOUND EXISTING FAULT 28-20050 FQPU INTERNAL FAULT.  REPLACED FQPU AND ACCOMPLISHED TESTS PER MM.  ALL CHECKS NORMAL.  (M)

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