It is the pilot's reaction at the moment rather than the occurrence of an inadvertent door opening itself which is of great concern to the safety of a flight, this is true in most instances. In flight, a door opening may be accompanied by a noise, which is sudden and loud. The door opening may also be accompanied by sustained noise level and possible vibration or buffeting. If this incident distracts the pilot to such a degree that he or she focuses his or her attention on the open door rather than maintaining a good control of the airplane, although disruption of airflow by the door is very insignificant, loss of control may still take place as a result. In flight or on takeoff, in the event of an inadvertent door opening, the following procedure should be adhered by the pilot. Firstly, the pilot should concentrate on flying the airplane, particularly in light single- and twin-engine airplanes, because a cabin door which opens in flight seldom if ever compromises the ability of airplane to fly. Some handling effects like roll and/or yaw may take place, but these problems can be overcome easily in most instances. If the door opens after lift-off, the airplane should not rush to land. Then, the airplane should climb to normal traffic pattern altitude, fly a normal traffic pattern, and make a normal landing. The seat belt and shoulder harness should not be released in an attempt to reach the door. The door should be left alone. Next, the airplane should be landed as soon as practicable, and the door should be closed once the airplane returns on the ground safely. The pilot should remember that most doors will not stay wide open. They will usually bang open, and then settle partly closed. The door will open wider by a slip toward this door, while it will be pushed closed by a slip away from it.