Indonesian aircraft missing off Jakarta

[silverstrata]

Originally Posted by Bergerie1

silverstrata,

I think you will find that a stick pusher was part of the Trident design as early as 1964, some 8 years before the accident in Staines!
https://www.flightglobal.com/FlightP...20-%200246.PDF

Yes, sorry, my bad. Apparently the fault was recognised in early flight testing back in ‘62, when the Trident entered a flat spin and refused to recover. (See Bartelski, ‘Disasters in the Air’ 2001, and the Flight International page liked above.)

But this shows the scale of the problem. As that very interesting Flight International’ page says, Hawker Sidley (Bae) then had to perform 3,500 stalls on the Trident, with a stick pusher added, before the ARB was satisfied that the new system was reliable. (It would appear that the Trident was the first jet or passenger aircraft with a stick-pusher.). But this report goes on to say:

. Needless to say the system has been engineered (with full duplication) to make sure that if it malfunctions, it cannot create a hazardous situation.

Hmm, so did Boeing do as much testing? And did Boeing do enough to ‘ensure a malfunction would not create a hazardous situation’...?

Silver