Originally Posted by
tdracer
The windscreen and surrounding structure is common between the 757, 767, and 777, and I'm not aware of any windscreen penetrations on any of those types.
However there is still a risk with large birds - during the development of the 757-300 and 767-400ER, it was determined there was a vulnerability with the forward bulkhead - a large enough bird could penetrate into the flight deck. I don't know if the requirements changed after the initial 757/767 cert, or it was due to better analysis tools, but the bulkhead had to be beefed up in some areas. I'm reasonably sure it was never retrofit.
90,000 hours is not that old for a 767 - even before I retired I was aware of several passenger 767s that had more than 100,000 hours and were still going strong.
FWIW- The initial 767 cockpit was designed for 3 crew- but with the then onset of two crew- additional rerouting of several systems ( eg hydraulics and switches rerouting ) About that time the chicken cannon was brought into play ( firing a frozen chicken from an air cannon into a partial cockpit structure to determine windscreen and ' skull cap ' strengths). Forget the weight and speeds involved ..
The result was that the ' skull cap' above the windscreen and the window framework had to be redesigned mostly with titanium. The skull cap cuz some important switches and valves were located there and damage or loss could cause major flight control issues- but still had to be within reach of pilot and copilot..
While the first one or two flyable 767.s built may not have had the rework, I am sure all the rest had that redesign.