<blockquote><font class="small">In reply to:</font><hr /><p>Radiator panel on STS-115 took MMOD hit. This is first or second largest hit in history of the Shuttle. 0.108 inch diameter at entry point. One-half inch thick honeycomb damaged. If hit were on RCC, it would have penetrated, but criticality of resulting damage is not known<p><hr /></p></p></blockquote><br /><br />Wow!!!!<br /><br />Might be a good argument in favor of always doing that last-flight-day inspection of the TPS. After all, MMOD can happen anytime, so the later the inspection occurs, the more likely you are to spot the damage. The radiator was obviously still functioning well enough to complete the mission, but a TPS strike could've made a safe return impossible, or at least neccesitated an attempted TPS repair.<br /><br />Of course, MMOD is the one risk you simply can't avoid. It is a fundamental hazard of spaceflight, and there's only so much you can do to protect against it. (Sort of like bird strikes on airliners; they do what they can, but there's only so much they can do.) <div class="Discussion_UserSignature"> <p> </p><p><font color="#666699"><em>"People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff."</em> -- The Tenth Doctor, "Blink"</font></p> </div>