According to reports, a spokesman for the US Federal Aviation Administration said that the agency issued emergency airworthiness instructions for Boeing 737NG and 737classic registered in the United States to check whether the air check valves of these aircraft were damaged, resulting in double engine failure.
The directive is applicable to aircraft that are not operating for seven consecutive days or more, the report said. Previously, inspectors took the aircraft out of the warehouse and found that the air check valve on the aircraft was damaged.
The Federal Aviation Administration said that if the aircrafts air check valve is found to be damaged, the valve must be replaced before the aircraft is put back into service.
Source of this article: Zhang Zutao, editor in charge of chinanews.com_ NT5054