# SDR ASAA2025121263267

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 12, 2025
- Submitted: December 23, 2025
- Operation: Air carrier
- Aircraft: [N215AK](https://openairdocs.org/aircraft/N215AK), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36347
- Aircraft time: 20,346 hours, 6,411 cycles
- System (JASC): [3520 · Passenger Oxygen System](https://openairdocs.org/jasc/3520)
- Part: O2 Generator
- Part number: 4441806012
- Part serial: 14913
- Condition: Faulted
- Location: Zone 900
- Part time: 20,346 hours, 6,411 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2025121263267

## Discrepancy

WHILE ATTEMPTING TO DEACTIVATE THE LAV E LAVATORY SERVICE UNIT (LSU), THE OXYGEN GENERATOR PULL-CORD WAS INADVERTENTLY ENGAGE AT A TIME WHEN SAFETY PIN WAS NOT INSTALLED. DESPITE THIS UNINTENTIONAL ACTIVATION OF THE PULL-CORD, THE OXYGEN GENERATOR DID NOT INITIATE OR DISCHARGE OXYGEN. GROUNDED - YES. REMOVED AND REPLACED LAV E LSU OXYGEN CYLINDER REF AMM 35-22-51.

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