Not sure about the impact and mag settings though
Standing orders around Weserubung with all the torpedo problems were 3 impact and 1 mag loaded in the tubes
If it could be changed while in tube there would have been no need for that order
Quote:
I have come to the following conclusions regarding the boats:
1)In Zone O and to the north of it, keep 3 torpedoes with switch setting A, and 1 torpedo with magnetic fuse setting, ready for action.
2)Fire on ships only with setting A. Depth setting depth 2 meters.
3)Always double shot, first torpedo setting A, depth 3 meters, then torpedo with magnetic setting, depth - draught - 1 meter, time interval if possible 8 seconds
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http://www.uboatarchive.net/BDUKTB30262.htm