LEAD: ANA plane came within 30 seconds of crashing after wrong instruction
Wednesday, November 24, 2021 8:37 AM

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TOKYO, Nov. 24, 2010 (Kyodo News International) --
(Editors: ADDING INFO)

An All Nippon Airways jetliner could have crashed in Hokkaido within 20 to 30 seconds of being warned of its proximity to a mountain had it not carried out an avoidance maneuver, the Japan Transport Safety Board said Wednesday.

The panel is investigating the incident involving ANA Flight 325, operated by Air Nippon Co., an ANA group company, which came perilously close to hitting a mountain while flying into Asahikawa, Hokkaido, from Chubu airport in Aichi Prefecture in October.

According to the panel's preliminary report based on an analysis of the aircraft's flight recorder, the Boeing (NYSE:BA) 737-800, with 57 passengers and crew on board, came as close as 220 meters above the top of the 2,197-meter Mt. Pippu in Hokkaido after it began a crash-avoidance maneuver.

The pilots took the maneuver after being warned by an on-board ground proximity warning system. The aircraft was making a descent at the time as a controller at the Sapporo Area Control Center had instructed it to drop to about 1,500 meters in altitude even though aircraft were not allowed to go below about 3,000 meters in the area.

The ground proximity system issued alarms three times during the incident, including one that said ''Terrain -- Pull Up,'' according to the investigative panel. The pull-up alarm is issued when an aircraft is likely to hit the ground in about 20 to 30 seconds if it remains on the same path.

The panel is set to investigate the case further by checking recorded data of radio communications with air traffic controllers and records on the aircraft's ground proximity warning system.

No one on board the aircraft was hurt in the incident, and the plane landed safely at Asahikawa. The controller in question apparently forgot about the minimum flying altitude in the area when issuing the incorrect instruction, according to the Land, Infrastructure, Transport and Tourism Ministry.

Most passenger aircraft now in service in the country are equipped with a sophisticated ground proximity warning system that checks GPS-based position data against geographical information, according to the ministry.

(Source: )
(Source: Quotemedia)
 

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