Source: Elines 

As we enter the season of thunderstorms and increased clear air turbulence, a reminder on cart safety and the proper handling of these tools that can become injurious to Flight Attendants is in everyone’s best interest.  Standard operating procedures require:

1.     Never leave a cart unattended. A cart is considered unattended if a Flight Attendant is more than three rows away from the cart.

2.     Carts should not be parked out of their normal galley takeoff/landing positions unless they are properly restrained. Is there a tie down?

3.     Ensure the cart brake is engaged unless the cart is being moved.

4.     Galley carts and the galley itself should be maintained in an orderly fashion at all times, due to the possibility of turbulence or evasive actions. Keep as many supplies as possible stowed or left in their containers. The top of the carts should be kept as clear as possible. During light turbulence, when service can continue, it is advisable to discontinue serving hot liquids and remove them from the cart. 

5.     Carts should not restrict immediate access to jumpseats. You do not have immediate access to the jumpseat if you must first move the cart to get to the jumpseat.  Remember, clear air and unexpected turbulence can result in career ending injuries.  Is it worth it to take the chance?

6.     Carts should not restrict immediate access to emergency equipment