What essential engineering principle linked the Apollo 1 failure to the need for later redesigns?

Answer

The cumulative effect of flammable materials in a pure oxygen environment.

Apollo 1 was a failure rooted in the combination of design choices, specifically the use of flammable materials coupled with the pure oxygen environment during ground testing.

What essential engineering principle linked the Apollo 1 failure to the need for later redesigns?
NASAfailuremissionApollospace program