Thank you all for bringing back long forgotten memories of the Trident Auto Pilot system I was a avionic mech who helped to de-snag all the defects in the central area at LHR crawling under the flt deck floor to the "Electrics bay"to change the triplex system of pitch,roll,yaw , and autothrottle computers which were situated there plus that blasted signal generator that was housed there as well without which we would never have be able fault find and recertify the Autoland . it had its faults as a system ie it had mechanical switching as electronic switching was not available at the time and these used to stick and that channel was "thrown off " by the the other channels ,but from the late 60s to the end of the Tridents life it did 1000s of Autolands safely and may be did not repay the huge amount of the costs of development but it cut down huge diversion costs in bad weather But it was the first and the A.R.B. laid down very hard demands to reach its goals
it could all be summed up by the remarks the passengers said which were "Did WE Land in this fog, how are we going to drive home ?"
