trooper

I realise you are probably joking.. but... for those who DO think this is a good idea (and they are out there)..
Challenges.
1. Getting OUT of the aircraft.

a. How would you open a door?
b. If you COULD get a door open, how would you safely EXIT from a side door into such a fast airflow (without - to use the Military phrase - "counting rivets" down the side of the aircraft) Lets not even think about unusual aircraft attitudes...

Yes, military parachutists exit from the side door of large aircraft, even some jets... but these are aircraft flying unpressurised , at minimum speed, and straight and level. And did I mention the wind deflector that is powered out in front of the exit door? No? It sorta helps...

But OK... lets assume you find a way to safely get out.

2. Have you got the harness on, properly and snugly secure? Any idea how to do that? Any idea how to activate the parachute itself?

a. You found the ripcord/opening device? Great! What altitude are you at? Going to get that canopy open as soon as possible I bet? Really bad idea above, say, 20,000 ft..... without supplemental O2....
b. How are you going to LAND it? What do you WEIGH? (Over 100kg? Good luck!) The heavier you are the worse off... Have you practiced your PLF's? (Parachute Landing Falls)? Do you understand the absolute necessity of landing INTO the wind?

One last consideration. WEIGHT. Parachutes, even Slimpack pilots emergency types, weigh more than a few kilos.... Multiply that by the number onboard.... Just sayin...

Probably best that there is no way to actually jump!!! (Its an interesting exercise to think about it though.....^)

EDIT! (Cos Im having fun thinking this through)

OK.. I think there is ONE scenario where pax parachutes could work. Its dependent on a few conditions being met...

1. The aircraft is low enough to depressurise without problems for the pax. (And so doors can theoretically be opened)
2. The aircraft is over LAND.
3. The pax all have time to work out and correctly put on the parachute rigs.
4. The aircraft is able to fly slowly enough (under 100 knots preferably) and straight and level for LONG enough to allow all to exit.*
5. The pax all manage to safely exit, activate the parachutes, avoid entanglement with each other, and land reasonably intact.

* The second last jump of my basic para course was a "simultaneous double door" exit from a C-130..32 out each side...in.... theoretically 32 seconds (we actually did it a little quicker) That perhaps gives some indication how long it would take to clear out . say, a 777.

The question that springs to mind of course is..if all those conditions were able to be met..is there actually ANYTHING wrong with the aircraft????