Boeing is having a rough time of it right now, with parts falling off its planes left, right and center. Just last week, a wheel came loose and smashed through a car, and earlier this year the door from a 737 Max aircraft broke off mid-flight. That mid-air disaster sparked an audit from the Federal Aviation Administration, which has gone far from well.
Submariner here. After several incidents in which submarines imploded, burned, or otherwise caused death and/or endangered thermonuclear weapons systems, our current procedures specify every single item used down to specific serial numbers, with specific authorized substitutes. If the authorized substitute cannot be found, the procedure is simply not done, and if necessary for ensuring the actual safety and conduct of the submarine’s primary mission, the entire multi-million-dollar mission is cut short and the ship surfaces to either receive the requisite supplies or goes back to port. Specific serial numbers for lubricants, specific stress-tested seawater-proof pressure-resistant alloys for bolts, specific serial numbers and part numbers for fuses, specific torque wrenches, even specific serial numbers for indicator lights. Every single maintenance step of certain procedures are read out loud at least three times and re-confirmed and acknowledged by both the worker and supervisor before being conducted, including the opening and closing of maintenance panel doors.