Are you sure about the bold bit? My Dash 8 300 QRH basically has three landing gear checklists. One for the alternate gear extension, one for a failure of a green down and locked light, and one for a door advisory light.
Yeah my bad for not being precise, there are a variety of checklists so you could find a crew following this list...
Landing Gear Fail to Indicate Locked Down
(gear lever selected down)
Note > amber and/or red advisory lights may be illuminated.
If any of the instrument panel green gear locked down advisory lights fail to illuminate:
Gear alternate extension door - open
Gear locked down indicator - on / check / off
gear alternate extension door - close
If all three alternate extension green gear locked down advisory lights illuminate
normal landing can be made
end
original bold