# NTSB DCA11WA018: Boeing 737, Rio De Janiero, Brazil, December 13, 2010

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Foreign investigation
- Date: December 13, 2010, 10:00 local (10:00 UTC)
- Place: Rio De Janiero, Brazil
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Defining event: [Enroute-cruise: Pressure/environ sys malf/fail](https://openairdocs.org/ntsb-events/331)
- Highest injury: No injuries
- Injuries: 132 uninjured
- Status: Led by another country's authority
- NTSB office: Major Investigations Division
- Lead agency: Other
- NTSB case key (mKey): 78157
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DCA11WA018
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/78157/pdf
- Page: https://openairdocs.org/ntsb/DCA11WA018

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Enroute-cruise: Pressure/environ sys malf/fail](https://openairdocs.org/ntsb-events/331) (defining event); cases with it: [All aircraft, 116 cases](https://openairdocs.org/ntsb-events/331/sequence.md)

## Factual narrative

The aircraft stopped to climb to cruising level at level 330, because the pilots realized that the pressurization system was not working properly. The "CABIN RATE OF CLIMB" was indicating +500ft/min, the "ALT CABIN INDEX" 8.0, and the differential pressure was 5.0. After a few seconds, the "ALT CABIN INDEX" increased to 10.0. The crew performed the QRH procedures and returned to land at SBGL. The crew and passengers used the oxygen masks. The landing occurred without any damage or injury.The investigation is being conducted by the Centro de Investigaçáo e Prevençáo de Acidentes Aeronauticos (CENIPA) od Brazil. All inquiries should be directed to them at: SHIS — QI 05 — Área Especial 12 LAGO SUL Brasilia — DF — CEP 71615-600 Brasil Website: http://www.cenipa.aer.mil.br

## Aircraft

- Registration: PR-WJO (not matched to a registry record)
- Reported make and model: BOEING 737 (321)
- Category: Airplane
- Damage: No damage
- Flight: Non-U.S., commercial
- Operator: Webjet
- Registered owner: Webjet
- Airworthiness certificate: Standard, Transport
- Departed: SBGL, Rio de Janeiro
- Destination: SBSV, Bahia
- Flight plan: IFR
- Airport: SBGL, Rio De Janeiro

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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