Loss of pressurization Serious incident Boeing 737-76N PR-GOV, Monday 28 March 2016

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Date:	Monday 28 March 2016
Time:	00:26 UTC
Type:	Boeing 737-76N
Owner/operator:	Gol Linhas Aéreas
Registration:	PR-GOV
MSN:	28580/135
Year of manufacture:	1998
Engine model:	CFMI CFM56-7B
Fatalities:	Fatalities: 0 / Occupants: 138
Other fatalities:	0
Aircraft damage:	None
Category:	Serious incident
Location:	Porto de Moz, PA - Brazil
Phase:	En route
Nature:	Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:	Belém/Val-de-Cans-Julio Cezar Ribeiro International Airport , PA (BEL/SBBE)
Destination airport:	Manaus-Eduardo Gomes International Airport, AM (MAO/SBEG)
Investigating agency:	CENIPA
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
During the cruise flight, leveled on the FL380, the aircraft had problems with the pressurization system with the lighting of two warning lights: LH BLEED TRIP OFF and RH BLEED TRIP OFF.
The crewmembers tried to act manually on the system and closed the Outflow valve, in order to control the pressurization of the aircraft. However, they were unsuccessful in their attempts and the cabin's altitude began to rise at an approximate rate of 2,000ft / min, even with the Outflow valve fully closed.
The crewmembers initiated an emergency descent to the FL100. Approximately, when crossing the FL300, the oxygen masks in the passengers’ cabin dropped automatically.
Upon reaching 10,000ft of altitude, the situation was normalized and the flight continued to the destination at that altitude.
The landing was carried out without additional abnormalities. The aircraft was undamaged. All occupants left unharmed.

Accident investigation: