Do pilots of airliners and jumbos do a walk around preflight check for every flight? How do pilots of large airliners and jumbos do sumping. If its not a requirement because of aircraft design, why not implement the same design attributes to smaller and ALL other aircraft?
NO, not all airline pilots do a walk-around for every flight.
At my airline, maintenance personnel do a "Pre-Departure Check" (PDC) before each flight from all main bases on all wide body aircraft. (A330, B767, B777, and B787)
The PDC includes:
1) a walk around
2) a check of critical systems
3) a signature in the Journey logbook
As a result pilots very rarely do a walk around on the wide body aircraft.
If we happen to land somewhere without company maintenance, then a walk around would be done by the pilots. If it were an ETOPS flight, we would also have to make an entry in the Journey Log Book stating that the APU oil level was checked by noting the EICAS APU Oil Quantity reading.
In addition to the maintainance walk around, the ramp crew also does a quick walk around inspection just prior to push back.
Yes, pilots of airliners do a walk around to visually check the aircraft before every flight, just like pilots of smaller planes do. A quick YouTube search brings up quite a few videos which explains the process.
The short version is, for items that are on the ground or within reach of the pilot, comparatively detailed checks are performed. For items that are beyond reach, a visual inspection is performed.
Due to the design of the aircraft, some checks that are possible on smaller aircrafts are impractical on airliners. For example you cannot move the flaps and elevators by hand. However, you can move them by using the yoke in the cockpit, once hydraulic power is on. There is a sensor which displays the position of the control surfaces in the cockpit. In a small aircraft, the pilot will move the yoke, then turn his head around to visually inspect the control surfaces are deflected to the correct direction.