The 767 does not have a manual system to let the gear down if the primary fails. What it has is an electric backup that trips the up-lock boxes to go into free fall to extend the gear. It would appear and I am only speculating that the aircraft suffered a multi system failure. I would guess electrical on the initiation side of the hydraulics and then on the electric up-lock trip circuit. The 737 system is much simpler, a small panel beside the co-pilot with three cable pullers, one for each leg. A direct link to the up-lock boxes from the cockpit.........KISS....................Keep It Simple Stupid!!
Matt
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