farmerman wrote:Georgeob--can a 777 land fully by wire? .
Yes - they have been around for a long time. There may well be some local airfield/aircraft certifications & restrictions limiting it in some places - however I suspect Heathrow has all the best features.
We even had systems that were theoretically able to land an F-14 (and other aircraft) on a carrier at night. However, I don't know anyone who would trust it - there is just no way to compensate adequately for the motion of the flight deck, which describes kind of a figure eight with vertical & lateral amplitudes of (typically) +/- 20 ft, in a normal sea and over twice that in rough conditions. (your hook to ramp clearance on a perfect pass is about 13 ft and you have to engage the wire within 10ft of the centerline.) However we would often use it at night up to about a quarter of a mile from the ramp. The auto throttle was more useful - it would adjust engine thrust to maintain a preset angle of attack (this may sound a bit backwards, but - unlike airliners - we flew a constant attitude, nose high approach all the way down the glide path.)
Disengaging either system had its pitfalls if the pilot wasn't aware of it and alert. That was the basis for my speculations above.
Finally the ships would frequently restrict their electronic emissions to avoid detection, and there seemed little point in becoming dependent on an automatic system (the data link to the auto pilot) that might not be there when you really wanted it.