On receiving a radar contact on an airplane, I watch it for a moment. If it's going to pass rather far away, I simply ignore it, or change course away from it.
If it looks like it is going to be close, I take her down to periscope depth with the radar mast up, and watch for a bit longer. If it is still coming towards me, then I take her deep.
I hate having to go deep for airplanes, so I try to avoid it if possible. But I'd rather go deep instead of trying to dodge falling bombs.
When coming back up, pause at periscope depth for a bit, and use the radar. It's not good to surface right in front of an airplane. It's a lesson you only need to learn once.
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