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Yes. Safe Hp for the shuttle is around 82 n.mi (151.864 km). Below this altitude stable orbit is not assured for 24 hrs.Thats wrong. 110 km (89 minutes period) would already mean reentry before the orbit is complete.
Safe Hp is the point where a de-orbit burn could be stopped for any reason and you would be assured of at least 24 hrs in a stable orbit. Once you have passed Safe Hp you are committed to entry and landing somewhere and it is better to continue the burn rather than doing an early cut-off.