[jpsb]

Didn't the FAA give Boeing a hard time over the two engine 777, extra rigorious testing etc? I recall reading something along those lines.

[Prophet in the wilderness]

In those rigorous tests, the 777 was flown on only one engine ( yes, that is correct, one engine ) , the 777 is designed to fly on one engine.
I have a book on the Boeing 747 called: Boeing 747
Design and development since 1969
by Guy Norris and Mark Wagner.
You would be amazed what amount of testing, torturer, and abuse they put those planes through before they are certified.
The wing load testing on the 747, they took weights and pulleys and bent the wing in testing to the point were it was flexed up in the air 30 feet before it broke, and in their testing, Boeing discovered that the wing of the 747 was " STRONGER " than they realized, and it was not necessary to " BEEF UP THE WING " .