** ARN Media A1N.AX slides as much as 20.7% to record low of A$0.23
** Stock hits biggest intraday pct drop since August 20, 2015
** Entertainment co says Jacqueline Henderson, related co commence legal proceedings against co's unit Commonwealth Broadcasting Corporation (CBC)
** Proceedings relate to termination of Henderson's contract following complaint letter to CBC, citing psychosocial health, safety, bullying concerns linked to radio host Kyle Sandilands
** Co says applicants claim compensation of at least A$82.3 mln ($56.4 mln), payment of pecuniary penalty plus interest and costs
** Disputes claims, intends to defend proceedings
** Says unable to reliably estimate outcome or any potential financial impact
** YTD, AIN down 34.2%
($1 = A$1.4582)
(Reporting by Aamir Sheik Khalid in Bengaluru)
((Aamir.SheikKhalid@thomsonreuters.com))