How about working outdoors as the temperature soars up to 38 degree Celsius? Well, for Zheng Jian, it’s just another day working as an aircraft maintenance engineer at an airport in Hangzhou, east China's Zhejiang Province. As we all chill inside our air-conditioned offices, Zheng still needs to step out and make sure that all aircraft are in good health. /VCG Photo

Zheng conducts nearly 100 checks involving mechanical facilities, engines and electrical capacities on each aircraft parked on the tarmac. Guess what, he gets only half-an-hour to complete the checks. /VCG Photo

The airplane just landing on the tarmac could be really hot and it's often called "Big Oven" by airport engineers. /VCG Photo

The places where Zheng spends most of his time checking are the hottest areas on the aircraft, such as the exhaust port of air conditioner where the temperature could reach up to 127 degree Celsius. /VCG Photo

He's extremely careful with every small detail, even the slightest of problem could prove to be fatal for the flight. Zheng is responsible for the security of the passengers on board. /VCG Photo

In order to save time, he usually rides a bicycle to get to the next checking point. /VCG Photo

For an airport engineer like Zheng, he has to work 12-hours a day and sometimes when the airport receives too many airplanes, he has little time or even no time to have lunch. /VCG Photo

According to a famous aviation security theory "Heinrich's Law" as many as 95 percent of all workplace accidents are caused by unsafe acts. "Since I'm determined to work as an aircraft maintenance engineer, I have to try my best to do it well," said Zheng. /VCG Photo