L-Acoustics A10 Owner's Manual page 72

Rigging procedures
This step requires two operators.
Hold the enclosure by the handle until the rigging system is locked.
4. One by one, secure additional enclosures under the array.
Connect each enclosure on both sides before adding the next one.
Final check
Visually check that no yellow labels are visible.
Manually check that all linking points are secured.
72 A10 owner's manual (EN) version 1.1