Summoning an armor stand with a falling sand entity riding it

I'm having an issue. I'm trying to summon an armor stand with a falling sand entity riding it. The armor stand will summon, but the falling sand is either invisible or not there.

Here's the command:

/summon armor_stand ~ ~1 ~ {Passengers:[{id:"falling_Sand",Time:1,Block:planks,Data:2}]}

This is in 1.12, and having the falling sand would make my life a whole lot easier. Does anybody have any ideas?

Solution 1:

Figured it out. Falling_Sand was changed to Falling_Block, so the command would be:

/summon armor_stand ~ ~1 ~ {Passengers:[{id:"Falling_block",Time:1,Block:"minecraft:planks",Data:2}]}