That is an exceptionally good memory of the old Batman series! I mean, I loved that show as a kid but had no recollection of that chopper.
I know it featured in the 1960s Batman film, which is an absolute classic in terms of campy absurdity! They take the batcopter out to investigate a yacht in distress... Batman is lowered down to the yacht... ("lower the BAT-LADDER, Robin"... I kid you not!). But it was a trap, the yacht was a hologram! Robin accidentally lowers batman into the sea, and when he is lifted out there is a shark attached to his leg!
This immortal line follows..... "Robin! Hand me down the shark-repellant Bat-spray!" The spray does its job, and the shark falls back into the sea.... and EXPLODES!!!