A quick example....Sikorsky had a design problem with the Rotor Blade Retention design on the S-76A.....despite the Ira best efforts.....they had two failures.
We might also add the Gear Box problems on the EC-225....the Engineers thought they had that sorted out as well but discovered they did not.
Read the latest Report about that in the 225 Thread.
Then say we bring up square windows on the Comet.
The Titanic was unsinkable.
The F-117 Stealth was invisible....till one got shot down and a second one was almo st lost to a pair of SAM's.
The list goes on at great length.
Reality always trumps theory!
Last edited by SASless; 28th Apr 2017 at 18:59.