Thank you all. Very good comments.
The reason why I come to the forum is that I get to hear the good, bad or indifferent. The people in this forum are a cross section of owners across America.
I have work with polling before. The questions need to be work up, reviewed, reworked, formatted, listed tested and then the poll is sent out and people ignore it. It is very static and I am not a fan. So I would rather come in here daily and have a discussion with as many owners as I can.
So again, the installation comments. I have never said an A&P mechanic will not have the skills to complete the installation. I listed some reasons why we only sell and install at authorized service centers. If having to take your aircraft to one of over 800 service centers world wide to have the installation completed is going to keep you from purchasing the system then there is nothing I can do for you. AmSafe will not sell direct and we will not support a owner installed or non authorized service center installation scenario.
So let me go back to the question about what does the airbag system do. I really appreciate that question as it reminds me that as usual I jump in the middle instead of starting at the beginning.
Airbags are designed to prevent head and torso trauma in what would be considered a survivable aircraft accident. 80% (or close enough for this discussion) of all general aviation accidents happen in close proximity of the airport, and most of those occur in slow flight or at speeds that are survivable.
The number one injury and number one fatality is head and torso trauma from the vehicle occupant striking the interior of the aircraft despite using the aircraft seatbelt. The NTSB and the FAA have reviewed the operation and effectiveness of the airbag system and have provided substantial data to show that they operate as intended. Here is a link to the latest report http://www.ntsb.gov/doclib/safetystudies/ss1101.pdf Here is one from the FAA http://www.faa.gov/about/office_org/headquarters_offices/avs/offices/afs/divisions/alaskan_region/media/FSI_Report_AK.pdf
The system has an electronic module (EMA) with an on-board battery pack. The system does not interface with aircraft power. The seatbelt airbag system is contained in the lap belt portion of the harness. The EMA has two position sensors that is looking for force (greater than 9gs) and time (45ms or longer) and both force and time have to be seen before it triggers the system. The signal is sent to the inflator bottle (7000psi helium argon, non toxic, non flammable, deploys at room temperature) and deploys the charge. The charge travels down the inflator hose and fills the airbag. The airbag fills the area in front of the seat occupant and the occupant moves into the airbag , which prevents the focal point of impact and mitigating the head or torso trauma.
The total deployment scenario is about 50ms, and the bag stays inflated for 3 - 5 seconds before self deflating. http://www.amsafe.com/videos/ to see some testimonials and to see videos of the airbag system in operation.
I hope that sheds some light on why we make this system.
Richard