An All Nippon Airways passenger jet made an emergency 10,000-meter descent over the Pacific on Saturday after suffering glitches in both of its two air-conditioning and pressurization systems, Japan’s transport ministry said on Wednesday.
The incident occurred at around 2 p.m. when the Boeing 787-8 jet was on its way to Narita International Airport from San Jose, California. None of its 163 passengers and crew were injured.
According to the ministry, the air-conditioning and pressurization systems stalled when the ANA plane was flying at an altitude of around 13,000 meters about 580 kilometers northeast of Narita airport.
An emergency was declared and the plane descended to an altitude of 3,000 meters in order to keep the air pressure in the cabin stable.
After flying at the lower altitude for about an hour, the emergency was lifted and the plane landed at the Narita airport.
The transport ministry has recognized the emergency descent as a severe incident. It sent four investigators to the airport on Wednesday.