# SDR CALA2026081718669

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 14, 2026
- Submitted: August 17, 2026
- Operation: Air carrier
- Aircraft: [N57286](https://openairdocs.org/aircraft/N57286), registered now
- Make and model: Boeing 737-8
- Registry model: [Boeing 737-8](https://openairdocs.org/model/boeing-737-8) (OpenAirDocs)
- Aircraft serial: 61854
- Aircraft time: 12,491 hours, 4,305 cycles
- System (JASC): [5100 · Standard Practices/Structures](https://openairdocs.org/jasc/5100)
- Part: Relay
- Part number: BACR13CF2AB
- Condition: Faulted
- Location: Zone 100
- Stage of operation: IN
- How discovered: V
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026081718669

## Discrepancy

NITROGEN GENERATION SYS HAS BLUE LIGHT.   PLACARD INSTALLED *DM*.  PERFORMED BITE TEST NGS GROUND OPS IAW AMM 47-00-00-800-801. TEST FAILED: FOUND CODE 47-30062. PER FIM, FAULT: 47-30062 47-31 TASK 830, NEED TO VERIFY THERE IS NO FUEL IN THE NGS LINE IN AMM 47-21-00-700-801. PERFORMED LEAK CHK OF NEADS LINE IAW FIM 47-31, TASK 830, IAW AMM 47-21-00-700-801. NO LEAK OR APPARENT FUEL ODORS DETECTED.  PERFORMED VOLTAGE CHK OF THE NGS SENSOR M2692 WITH A VOLTAGE READING OF ABOUT 25 VDC. THE NGS OXYGEN SENSOR HAS ALREADY BEEN REPLACED ON LOGPAGE 9838714.  VERIFIED CONTINUITY FROM THE NGS OXYGEN SENSOR TO  NGS.  CONTROLLER D13804 PIN 44 TO PIN E AND 42 TO PIN D AT 0.4 OHMS. VERIFIED CONTINUITY FROM NGS OXYGEN SENSOR TO NGS CONTROLLER PIN G TO PIN 15 AT 0.4 OHMS. CONDITION ON CONNECTORS OK.   ALL STEPS PERFORMED IAW FIM 47-31, TASK 830.  REPLACED THE R1001 NGS ALTERNATE POWER RELAY IAW WDM 47-30-11-1. BITE TEST OK IAW AMM 47-31-02-740-804. LIGHT IS GREEN. CLEAR MEL. PLACARD REMOVED.

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