* Ackermann is second deputy chairman at Siemens
* Ackermann may surrender post - source
* Move follows resignation from chairman position at Zurich
FRANKFURT, Sept 11 (Reuters) - Josef Ackermann, the formerchief executive of Deutsche Bank, will likely stepdown from his position as second deputy chairman at Siemens, a source familiar with the plan said on Wednesday.
The move comes two weeks after the Swiss executive resignedas chairman of Zurich Insurance following the suicideof the chief financial officer, and marks a dramatic turn in theonce stellar career of the 65-year-old who until last year whowas one of Europe's most powerful bankers.
Both Siemens and Ackermann's spokesman declined to commenton Wednesday.
In June Ackermann clashed with fellow Siemens directors during a tussle over whether to oust Chief Executive PeterLoescher.
When supervisory board chairman Gerhard Cromme pushed forLoescher to be removed immediately, Ackermann was among the fewexecutives on the board to dissent, saying, "Gerhard, you can'tdo it this way."
Ackermann is also a member of the nomination and successioncommittee at Royal Dutch Shell where he is anon-executive director, and a director at Investor AB, an investment company founded by Sweden's Wallenbergfamily.