Photo by Fred Robel  #avgeek    

Originally shared by Fred Robel

On a humid/wet day, the pneumatic starter puts out a lot of visible moisture, as the air is compressed and expanded out the exhaust vents.

“Turning number four!”

B747-200F, and a JT9D-7R4G2 powerplant

#avgeek   #aviationgeek   #aircraft   #airplane   #aviation   #boeing