the srs does a self check every time that you key up and turn the car on. there is no 'check' per se other than this self check.
if the vehicle was a repaired vehicle with 'dummy bags', then i believe the srs has to be turned off and the bulb removed (not 100% sure though, and it most likely will vary by state law on this aspect).
other things that could affect srs deployment would be the use/non use of seatbelts, g force of the impact not surpasing the threshold, or the system being shut down due to failure of a self test (in which case, the bulb should have been on constant), or even a blown bulb (which would hide the fact the system is inoperable due to lack of ilumination).
without actually looking into the recorded data, there is no way of knowing what the facts of the incident are.
df
That is true, the SRS system does a check to make sure that the components are still there (undeployed, however beyond this there is a whole lot unknown to the system (whether the deployment substance is still good, etc). The bag could have been defective in some way and the SRS system couldn't have picked it up.
Also SRS is being thrown around here, does anyone know what it is? SUPPLEMENTAL Restraint System; it's designed to supplement the seattbelt, not designed to protect your body for even the slightest thing.
airbag deployment is not guaranteed ! which is tuff to swallow ! i've been to quite a few high speed accident's where the airbag has not gone off ! usually resulting in a skull sized hole in the windscreen !!
Airbags are never guaranteed to go off, it's a chemical reaction, odium azide (NaN3) with potassium nitrate (KNO3) to produce nitrogen gas, that inflates the bag. If any of these chemicals was not released in the correct proportions or one of the chemicals was contaminated, the bag would not have gone off.
Generally you have to have a 30 MPH speed change for the airbags to deploy and there are usually a number of sensors in the front that have to be triggered as well. A 30 MPH speed change is quite a bit. All vehicles have to meet the FMVSS of either a 10 or 15 mPH bumper impact, don't remember off the top of my head but there are standards that vehciles have to meet for frontal or rear end impacts.
YOu can't always look at the damage and tink the airbag should have gone off. Modern cars are now designed to crumple and give which decreases the "impulse" time and absorbing the energy instead of transferring it to the occupants. That's also why airbags are a supplemental restraint in addition to seatlbelts. I'm curious to know if the person who had the bloody nose had their seatbelt on. IN theory if your belted theres nothing for you to hit since the seatblet will stop you.
very true about the speed, I nearly forgot about that!
also very good comment on not judging the safety of a car by the way it crumples. As said before newer cars (esp ACE constructed cars) are designed to crumple to absorb the impact of the crash so the occupants do not feel as much of a sudden deceleration (which is what really kills you). However the cars are constructed to keep the passenger compartment safe as well (non-crumple zone) which should stay intact during the whole ordeal. I wouldn't be surprised if the driver of the 745 had his seat and wheel set incorrectly and didn't wear a seatbelt (no idea how he could have done that, my 7 chimes the brains out of you)
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