@Red:
Proper procedure of an alternate gear extension is to always put the gear lever down first
1. LG Handle: DOWN
2. Airspeed: 190 Kts
3. ALT GEAR handle: Pull
…
So it would only happen to those not following the (BMS) checklists
True, for LG system malfunctions, and some electrical failures where prior to pulling the ALT GEAR handle, lowering LG system should be attempted with the DN LOCK RELEASE .
Makes sense really. You cant really know if the LG system has malfunctioned, unless you use the gear handle first.
For hydraulic system B and dual hydraulic failures, ALT GEAR is pulled first , and then the gear handle is lowered.