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Monday, August 26, 2013

Aviation Knowledge 3


It has been a long time since I last posted due to busy schedule. Thank you for the continued support. Today we will discuss on an interesting topic: Aircraft Cabin Doors.

I have many friends and even colleagues asking me this question before,” Can we open the cabin door during flight?” 

What do you think?

The answer is NO. This is because during flight at let’s say 35000Ft (11000m) The cabin is pressurized at about 8000Ft so that we can still continue our normal activities without the use of oxygen mask.

The pressure in the cabin is much higher than the pressure outside thus creating a pressure difference of about 8 Pound Square Inch (PSI). Lets look at the picture below.

As you can see above, the cabin door is open outward. Guys with some basic physics will understand that if the cabin pressure is higher than the outside pressure during flight, wouldn't it be easier for the cabin door to swing open? This is the part that confused many. 

Most commercial aircraft cabin doors are designed in a way that the door when opened, need to move inwards first before moving outwards. With 8PSI, even Arnie will have big problem moving an inch. Even if the door did managed to get open, which would not, the cabin door need to swing forward against the airflow during flight which would be even harder.

Having said and explained the above I hope your next flying experience can be a more assured and enjoyable one. However please do not attempt to try and open the cabin door during flight to test the system as any manipulation of aircraft safety equipment is a federal offense.