They get hot because they have no cooling fans and they're embedded in the seat. That's just how they're designed to work; it's safe.
Very. In addition to being rigorously tested and certified, as previously mentioned, almost all systems will self-protect from overheat. In the event that the protection failed, everything around it is certified non-flammable so it can't set the seat on fire. In addition to that, the flight crew has a switch on the flight deck to depower the entire IFE system with a single press so, if for some inexplicable reason the system went nuts, didn't shut down, and did continue to smolder or something, one call to the flight deck and it all shuts down. And the flight attendants all have portable fire extinguishers.
|Quoting flyenthu (Reply 4):|
Would the certification apply to airlines like Emirates and Singapore Airlines that do not come under the purview of FAA and JAA that are American and European (?) authorities?
The type certificate (the certification of the aircraft itself) was issued by the FAA and EASA. That certification applies even if the airline operating the equipment doesn't fall under FAA/EASA jurisdiction. Local regulators (e.g. Singapore or UAE) can change the rules but they essentially never do this except to be *more* restrictive than the original certifying agency. There are parts of the world where certification compliance is not well monitored, but UAE and Singapore are probably some of the best there are.