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Russian maintenance is in a class by itself, so there's that. The sanctions have reduced Russian aviation maintenance to Soviet-Era levels, and perhaps worse.
Any jet engine can have an uncontained failure, which breaks through the fire-resistant features of the design. These are very rare, because the design factors are quite extreme. The most common cause for an uncontained failure is an out-of-balance situation of the rotating parts, which turn at very high speeds for their size and weight. It is not possible to prevent every possible failure from becoming uncontained, and sometimes combinations of factors can upset the apple cart.
Kind of like having a crash-resistant automobile, but being caught between two loaded dump trucks.
Any jet engine can have an uncontained failure, which breaks through the fire-resistant features of the design. These are very rare, because the design factors are quite extreme. The most common cause for an uncontained failure is an out-of-balance situation of the rotating parts, which turn at very high speeds for their size and weight. It is not possible to prevent every possible failure from becoming uncontained, and sometimes combinations of factors can upset the apple cart.
Kind of like having a crash-resistant automobile, but being caught between two loaded dump trucks.