# SDR 99UAL900450

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 25, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N163UA
- Make and model: Boeing 747238B
- Aircraft serial: 21353
- Engine: Pwa JT9D7J
- System (JASC): [3520 · Passenger Oxygen System](https://openairdocs.org/jasc/3520)
- Part: Mask
- Condition: Droped
- Location: Cabin
- Stage of operation: LD
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900450

## Discrepancy

SEVERAL O2 MASKS DROPPED ON LANDING.  CAUSE WAS LIKELY A HARD LANDING.  MASKS WERE REPACKED AFTER LANDING.  THIS HAS NO SAFETY IMPACT.  THE OXYGEN SYSTEM WILL STILL PROVIDE OXYGEN TO ALL PASSENGERS IF SYSTEM IS ACTIVATED.

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