# SDR AALA202406256148

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 24, 2024
- Submitted: June 25, 2024
- Operation: Air carrier
- Aircraft: [N916US](https://openairdocs.org/aircraft/N916US), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6420
- Aircraft time: 80,683 hours, 12,483 cycles
- System (JASC): [2560 · Emergency Equipment](https://openairdocs.org/jasc/2560)
- Part: Bottle
- Part number: UNKNOWN
- Condition: Low Pressure
- Location: L4 Door Assist
- Stage of operation: UK
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202406256148

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: 4L DOOR CABIN PRESSURIZATION WARNING LIGHT IS ILLUMINATED IN FLIGHT AND ON GROUND. CABIN PRESSURIZATION DIFFERENTIAL IS ZERO (NORMAL) ON GROUND. REF: TSM 52-13-00-810-827-A, FOUND DOOR ASSIST BOTTLE AT 4L REQUIRED SERVICE.  SERVICE BOTTLE IAW AMM 52-10-00-614-001.  MESSAGE CLEARED.

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