What happened
On December 13, 2010, a Boeing 737 operated by Webjet, registration PR-WJO, ceased its climb to a cruising altitude of FL330. The decision to stop the climb was made after the crew observed that the aircraft's pressurization system was not functioning correctly.
During the climb, the crew noted the following instrument readings:
- "CABIN RATE OF CLIMB" indicating +500ft/min
- "ALT CABIN INDEX" at 8.0
- Differential pressure at 5.0
Shortly after, the "ALT CABIN INDEX" increased to 10.0. In response to the malfunction, the crew implemented the Quick Reference Handbook (QRH) procedures and elected to return to Rio De Janeiro (SBGL) for landing. During the event, the crew and passengers utilized oxygen masks. The aircraft landed at SBGL without damage, and there were no injuries reported.