Unable to switch off AIPSub has a diesel engine and fuel, but is unable to utilize either when run at Periscope depth after AIP fuel is exhausted
1. Run [PDb] Unable to switch off AIP (3.9.4).scn in GE
2. Run SSK at flank speed submerged until AIP fuel is exhausted so that there is no possibility of using up any diesel fuel
3. Come to periscope depth and attempt to engage diesel engine
3. Sub has a diesel engine and fuel, but is unable to utilize either when run at Periscope depth
[Edit] Undocumented new feature
http://www.matrixgames.com/forums/tm.asp?m=2132569