ShirleyShih,
I am not 100% following what exactly you are looking for, however, Take a look at the following
(This is from a engineers perspective and what is needed to do to maintain mechanical safety for the Air frame and it's systems but predominently it's for Pilot safety. (Life support Systems (LSS) (Inclusive of oxy masks in to a Airbus ect)
Anyone who is anyone who works with any aircraft components needs to adhere to the following guidelines set out by the
EASA - European Aviation Safety Agency
FAA - Federal Aviation Administration
There are more in depth requirements set out by Aircraft component manufacturers (individually) how ever they will all set their standards from the above, I however cannot go further into that for legal reasons.