# SDR AALA202602250435

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 24, 2026
- Submitted: February 25, 2026
- Operation: Air carrier
- Aircraft: [N839NN](https://openairdocs.org/aircraft/N839NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29557
- Aircraft time: 45,973 hours, 19,672 cycles
- System (JASC): [2820 · Aircraft Fuel Distribution System](https://openairdocs.org/jasc/2820)
- Part: Circuit Breaker
- Condition: Tripped
- Location: Spar Valve
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202602250435

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: AFTER TAKEOFF BOTH SPAR VALVE CLOSED LIGHTS ILLUMINATED BRIGHT AND CIRCUIT BREAKERS B3 AND B4 BEHIND FO SEAT BOTH POPPED. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT ORD. FOUND CIRCUIT BREAKER OUT NOT POPPED, ACCOMPLISHED SYSTEM TEST, PER AMM 28-22-00. VERIFIED NORMAL ENGINE RUN OPERATIONS AND INDICATIONS. NO FAULT FOUND.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.