# SDR KCSA2025101453

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 14, 2025
- Submitted: November 17, 2025
- Operation: Air carrier
- Aircraft: [N771CK](https://openairdocs.org/aircraft/N771CK), registered now
- Make and model: Boeing 777-36NER
- Registry model: [Boeing 777-36NER](https://openairdocs.org/model/boeing-777-36ner) (OpenAirDocs)
- Aircraft serial: 32791
- Aircraft time: 68,016 hours, 12,765 cycles
- System (JASC): [2840 · Fuel Indicating System](https://openairdocs.org/jasc/2840)
- Part: Tank Unit
- Part number: REFCORRACTIONS
- Condition: Unserviceable
- Location: Fuel Sys
- Stage of operation: LD
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/KCSA2025101453

## Discrepancy

FUEL IMBALANCE EICAS MESSAGE PRESENTED ON APPROACH TO LLBG NON-NORMAL EICAS CHECKLIST COMPLETED.  ACTION TAKEN: TROUBLESHOT IAW B777 FIM 28-22 TASK 847 AND B777 AMM 28-41-00 AND DISCOVERED BAD RH TANK DENSITOMETERS.  LOW FUEL EICAS MESSAGE PRESENTED IN FLIGHT ON APPROACH NON-NORMAL FUEL QUANTITY LOW EICAS CHECKLIST COMPLETED.  TROUBLESHOT PER 777 FIM 28-41 TASK 856, NO MAINTENANCE ACTION IS NECESSARY OK FOR SERVICE, NO DEFECTS NOTED.  DECLARED EMERGENCY,  3,200 LBS OF FUEL INDICATED IN RT WING TANK.  IAW MEL 28-41-1-2-2, CAT B, DUE 10-17-25, M PROCEDURE C/W, PLACARDS INSTALLED. 100275621: FUEL IMBALANCE EICAS MESSAGE AND FUEL QUANTITY LOW EICAS MESSAGE PRESENTED IN FLIGHT. CDU FUEL QUANTITY INDICATIONS FLUCTUATED. LT MAIN TANK FUEL PROBE NR 11 & 26 AND RT WING MAIN FUEL PROBE NR 3, 4, 10, & 22 REPLACED. FQIS TEST PERFORMED, RESULT "SATIS" AMM 28-41-00.

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