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First thing you need to remember is that pilots aren't the mechanics, not to mention that aircraft are about as complicated as it gets, especially commercial aircraft. "Safe Altitude" can mean a lot of things though. It could be that the plane has lost pressure, so the altitude where you can breath without oxygen masks is needed. Or it could be the altitude where you can dump the remainding fuel on board safely without it just spilling onto who knows what, causing another problem. The shits is complicated.
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