# SDR COEA2016042601900

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2016
- Submitted: April 28, 2016
- Operation: Air carrier
- Aircraft: N900FX
- Make and model: Aerosp ATR 42-320
- Registry model: [Aerosp ATR 42-320](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-320) (OpenAirDocs)
- Aircraft serial: 170
- Aircraft time: 32,302 hours, 36,282 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Unknown
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/COEA2016042601900

## Discrepancy

FLIGHT 7820 EN-ROUTE, AIR TURN BACK, DISCREPANCY.  WHILE EN-ROUTE THE CREW RECEIVED AN EXCESSIVE CABIN ALTITUDE WARNING.  THE CREW PROCEEDED WITH THE QRH, BUT WERE UNABLE TO CONTROL THE CABIN ALTITUDE.  THE CREW ELECTED TO RETURN & NO EMER DECLARED.  THE ACFT LANDED WITHOUT INCIDENT.  PERFORMED OPERATIONS CHECK OF BOTH LT & RT PACKS.  BOTH PACKS OPERATING NORMAL.  PRESSURIZATION CHECK OPERATED NORMAL, COULD NOT DUPLICATE.

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