Hotter than July

Down in the desert we’ve finished a series of hot weather tests on the 747-8 Freighter, and initial data shows that the airplane performed well.


RC522, the 3rd flight test 747-8, during ground testing in Arizona.

Basically we wanted to evaluate the capability of the 747-8’s new air-conditioning system during ground operations and flight.

Some airlines will operate the 747-8 in extreme climates, so this kind of testing is important in ensuring our customers’ expectations.


During the ground testing, Boeing Test and Evaluation and Environmental Control System engineers analyzed real-time data from temperature, pressure and airflow monitors.

Talk about “hotter than July,” the temperature exceeded 105 degrees Fahrenheit (40.5 C) during testing at the Mesa, Arizona location.

Obviously, an ideal place to conduct the hot weather tests.


Do not adjust your monitor. Any blurriness you may perceive around the 747-8 in the photo is the effect of heat rising from the desert floor in the triple-digit temperatures.

We’ll be doing further hot-weather testing at a later date for certification. For the time being, RC522 has now moved on to a cooler climate to conduct more tests.


500 flight hours - now in the books.

One last piece of news about the 747-8. We’ve reached 500 flight hours for the 747-8 Freighter test fleet. Last week RC521 achieved the milestone on a flight (pictured above) out of Victorville.

Comments (3)

Norman (Long Beach, California, United States):

It certainly looks hot over at Mesa, Arizona. It looks like the 747 has made some adjusting ground maneuvers near the runway boundary like if it was going back and fourth by the sign of it's tire tracks.

Angel (Murcia, Spain):

Thanks for the update, is really gratifying to see the new progress of the program and of course see again the Everett plant full of 747's.


Jack (Mesa AZ):

It sure was nice to see the 787-8 and the 747-8 out here in the past few weeks. I would like to thank all the 787 group and the 747 for their insight on the aircraft. The 787 group was by far a crowd favorite. Good luck with the testing.

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