No part of an aircraft is 100% reliable. Manual inspections are a fundamental part of keeping an aircraft safe. How do you know that the tires haven't perished? How do you know that a bulkhead isn't developing severe stress cracks? How do you know that the bearings on a control surface aren't just about ready to seize? Because the aircraft operator is required by law to systematically check every part of the aircraft according to a strict schedule.
Your reassurance is the fact that flying is the safest form of travel thanks to decades of diligent work by engineers, mechanics and accident investigators.
Your reassurance is the fact that flying is the safest form of travel thanks to decades of diligent work by engineers, mechanics and accident investigators.