If the 737 didn't have landing gear bay doors because of its low ground clearance, why did the 727 and 707 have the doors, given that these planes have similar ground clearances? - Quora
B737Theory - RAM AIR DUCT doors. The RAM AIR DUCT system supplies and controls cooling air to the air-to-air heat exchangers of the air condition packs. As the word describes it uses
![1st Royal Air Maroc Boeing 737 MAX 8 | Rabat Landing after Delivery Flight | CN-MAX 737 M8 - YouTube 1st Royal Air Maroc Boeing 737 MAX 8 | Rabat Landing after Delivery Flight | CN-MAX 737 M8 - YouTube](https://i.ytimg.com/vi/QZKGfyMQBHc/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLAmpimnJD8E6C2ez6cH5EyoHxRx-g)
1st Royal Air Maroc Boeing 737 MAX 8 | Rabat Landing after Delivery Flight | CN-MAX 737 M8 - YouTube
B737Theory - APU air inlet door The APU air inlet is installed on the right side of the aft fuselage allowing air to the APU engine and load compressor, and closes on
![airliner - What exactly are those openings in the bellies of many jetliners? - Aviation Stack Exchange airliner - What exactly are those openings in the bellies of many jetliners? - Aviation Stack Exchange](https://i.stack.imgur.com/mJHRy.jpg)