Brian Morrison wrote:
Matty F wrote:

A fire lasting half an hour would easily heat it red hot.
Nobody should have gone into those buildings after half an hour.

That's why the fire protection is intended to last for 45 minutes, to
give those that can time to get out.


Sadly though the impact force from a large airline was enough to shake
most of the fire protection loose as well. The original design specs
didnt allow for an aircraft at full speed hitting it - they went, quite
sensibly for a lost aircraft at approach speed hitting it by mistake and
engineered for that instead.