# SDR IPXA2026032070105

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 14, 2026
- Submitted: March 20, 2026
- Operation: Air carrier
- Aircraft: [N434UP](https://openairdocs.org/aircraft/N434UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 25465
- Aircraft time: 33,206 hours, 22,246 cycles
- System (JASC): [2820 · Aircraft Fuel Distribution System](https://openairdocs.org/jasc/2820)
- Part: Check Valve
- Condition: Faulted
- Location: Zone 100
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2026032070105

## Discrepancy

FUEL IMBALANCE IN FLIGHT OF 1900LBS WITH FUEL CONFIG MESSAGE. 7.2 LBS LEFT TANK, 9.1 LBS RIGHT TANK. ALL ENGINE INSTRUMENTS NORMAL INCLUDING FUEL FLOW. FMC CALCULATED AND TOTALIZER FUEL WITHIN 100 LBS NO FUEL IMBALANCE NOTED DURING ENGINE RUNS.  REMOVED AND REPLACED BOTH CENTER TANK MANIFOLD DRAIN CHECK VALVES IAW AMM 28-21-05-401. REMOVED AND REPLACED BOTH FWD AND AFT CROSSFEED VALVE BODIES IAW AMM 28-22-02-401 UP TO STEP F (14).

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