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The US shells out $50 million per year to maintain the C-17 Globemaster. This ludicrous budget includes general maintenance, engineering support, spare parts, and crews.
These undergo regular inspection, repair, and maintenance to make the C-17’s landings and takeoffs as smooth as possible. In total, it takes five people and two days to replace all of its fourteen tires.
If needed, its four Pratt & Whitney F-117 turbofan engines are tested rigorously before being released back into service. For a plane this big and pricey, it’s better to stay on the safer side.
Based in Alaska, this shop does the welding, designing, and fabrication of precision tools for aerospace weapons systems and support equipment.
It’s not unusual for air bases to have a dedicated manufacturing facility or shop that specializes in making spare parts. One example is Ellsworth Air Force Base which has its own aircraft parts store.