Originally Posted by despegue
snoozer,
With all respect sir,
Your calculations regarding the air pressure are upside down, and you must not use 30' but 27' in the calculation.
Please feel free to read these pages, but may I ask you kindly to refrain from actively participating if you do not posses a commercial Pilot licence?
There have been many occasions when members here have contributed in a positive way to threads, and not been a commercial pilot.
For instance, ATC can provide pertinent information at times as can engineers, cabin staff and others.
In the BA038 thread contributions from posters involved in fuel system component design and testing posted and in the Qantas Depressurisation thread someone who had experience in oxygen bottle manufacture and construction gave some very useful information.
There are a lot of people backing up the flight crew who make useful contributions here.