IC: Are these guns computerized or human controlled?
Summer possesses a
complete SDS Defense Grid. So, both, with layers of redundancy. From what I understand about how those systems work (and we don't have a lot of details, mind), they're computer controlled, but can be easily overridden by human operators.
What is likely to happen in this case is that the computers will not be able to plot a firing solution at your DropShips as you fly NOE. However, the human operators can manually track you, even if they can't fix you as a target. As they track you manually, they give permission for the computers to override
them and"take their best shot" at you if and when you become a target within their range, but it'll be an inaccurate snapshot since they won't have the time to really let their firing computers lock in (since you're only exposed for such a short time).
There are four alternatives to this plan:
1) Drop from orbit. Ground weapons will have four complete turns to fire at you (you fall 3 altitudes per turn, SO pg 22), and there's canonical evidence that NLs and ground-based capital missiles controlled by an SDS can accurately target Mech-sized targets.
2) Drop from within the atmosphere. The DropShips are likely (like 99% likely) to be blown out of the sky before they ever get near the drop point.
3) Fly NOE the ENTIRE way in and crash-land without the benefit of "spotting" your landing zone. The odds of striking an "instant-death" surface (elevation changes, etc) increase greatly, because your landing strip would then be determined essentially randomly.
4) Drop out of range of the ground weapons and move in to secure the bridges on foot. This allows the enemy to see you coming and move ground troops to stop you, as well as completely giving away the general strategy to take the planet.
Attacking a functional and alert planet defended by an active SDS is
dangerous (to say nothing of Terra's Reagan Defense Grid). Canon casualty rates seem to be in the mid 60% range. If you weren't badass elite troops, they'd never even ask you to do it. But that's what you get for being the best: the hardest assignments.
Also, since I've gotten PMs from people who know their military history, the rest of you may as well get to know about it too:
http://en.wikipedia.org/wiki/Operation_Deadstick