Table: helicopter_disks
Columns: aircraft
description
max_gross_weight
total_disk_area
max_disk_loading

Question: What if the description of a ch-47d chinook?
SQL: SELECT "description" FROM helicopter_disks WHERE "aircraft" = 'CH-47D Chinook'

Question: What is the max gross weight of the Robinson R-22?
SQL: SELECT "max_gross_weight" FROM helicopter_disks WHERE "aircraft" = 'Robinson R-22'