Checking the physical condition of your Drone before you fly is extremely important. Without checks, you are putting potential risk to lives and the expensive investment that is your drone. It's important to remember that by being a drone user, you are a pilot. General aviation pilots must undergo checks to their aircraft's, as seen in the video in TIP #2 - NATS Drone checklist video.
Before taking off, it is important to physically check your drone for any loose parts or areas of damage. Begin by checking that the unit’s blades are firmly attached and would not fall off the craft during a flight. Also inspect each blade for nicks or cracks. If one is found, it is important to ground your flight and obtain replacement parts.
Other parts that may come loose include the battery pack and camera. Ensure that the battery pack firmly clicks into its locked position and wiggle it with your fingers to ensure it won’t fall out during the flight. Your camera should also be checked to ensure that it is firmly attached and not in danger of falling.
Be conscious — if you see something that doesn’t look right, don’t fly it. Instead contact your drone manufacture.