An incident involving possible hypoxia (lack of adequate oxygenation) was recorded last week, in which the pilots of a passenger aircraft had to return to the airport of origin. The occurrence occurred with an Embraer E175 from Air Canada, registered under the registration C-FRQW, in the service of its subsidiary Jazz on a flight between Montreal and Newark, in the United States. The case was registered on Wednesday (8).
According to information obtained by The Aviation Herald , the aircraft took off from Montreal International Airport on flight AC-8944, with 44 people on board. During the ascent phase, at 16,000 feet (about 4.88 km) altitude, the crew felt hypoxia effects and noticed that the cabin altitude on the instruments neither increased nor decreased .
Faced with the facts, and as a precaution, the pilots put on their oxygen masks and lowered the aircraft to 9,000 feet (about 2.74 km) in altitude. It is worth mentioning that, in the event of a pressurization failure, pilots are trained to immediately lower the aircraft to an altitude where there is greater comfort for the human body in relation to the external atmosphere (less thin air).
After descent, the crew decided to return the aircraft to the airport of origin. Still on arrival, a go-around was performed at low altitude, before the pilots landed the aircraft without further complications. Such a rush would be unrelated to the previous situation of lack of adequate pressurization.
The Embraer E175 jet remained on the ground until the following day (9), having then made a new flight to Houston, in the United States. The Transportation Safety Board of Canada (TSB) reported that the crew did not declare an emergency or request priority during the occurrence. Subsequently, maintenance also reported that no faults were found on the aircraft.