DATA GENERAL <DGN> TO TAKE 2ND QTR CHARGE Data General Corp said it expects to record an extraordinary pretax charge of about 18.2 mln dlrs in the second quarter ended March 28. The company said the charge will result from a redemption of debt. On May 18, Data General said, it will redeem 150 mln dlrs of outstanding 12-3/8 pct sinking fund debentures due 2015. The redemption price will be 111.138 pct of the total principal amount of notes then outstanding plus accrued interest to the redemption date, it said. No interest will accrue or will be payable on the debentures starting May 18, the computer and communications company said. Data General reported a loss of 1.8 mln dlrs or six cts a share for the second quarter ended March 29, 1986. The loss included a charge of 3.8 mln dlrs from redemption of debentures. In the year-ago quarter, revenues fell less than one pct to 318.8 mln dlrs.