# SDR AALA202102169009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 15, 2021
- Submitted: February 18, 2021
- Operation: Air carrier
- Aircraft: [N171US](https://openairdocs.org/aircraft/N171US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1465
- Aircraft time: 66,157 hours, 24,860 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: O-Ring
- Condition: Inoperative
- Location: Apu Bay
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202102169009

## Discrepancy

AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS COMPLAINED OF BURNING RUBBER SMELL IN CABIN AND PASSENGER COMPLAINTS ABOUT BREATHING. IN COCKPIT WE SMELLED DEICE FLUID. RETURNED TO CLT. DECLARED EMERGENCY.  AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS COMPLAINED OF BURNING RUBBER SMELL IN CABIN AND PASSENGER COMPLAINTS ABOUT BREATHING. IN COCKPIT WE SMELLED DEICE FLUID. RETURNED TO CLT. DECLARED EMERGENCY.  REMOVED AND REPLACED APU GENERATOR "O" RING IAW AMM 24-23-51. ACCOMPLISHED J/C 26L00021001, 26L00021002, 26L00021004.

---
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.