CAPT OF A CPR HELI INADVERTENTLY ENTERED CLASS D AIRSPACE.

Narrative

DEPARTED NEW YORK HELI 6N5. I WAS ACTING AS COPLT. MY RESPONSIBILITIES ARE SETTING UP RADIOS AND NAV AND MAKING RADIO CALLS. PLT KEEPS HIS EYES OUTSIDE AND FLIES ACFT. AFTER WE DEPARTED 6N5; I ASKED PLT HOW HE WANTED TO PROCEED TO DEST. HE REPLIED UP HARLEM RIVER TO GEORGE WASHINGTON BRIDGE. LGA CLASS B CLRED US TO GEORGE WASHINGTON BRIDGE WHERE WE CLRED CLASS B AND LGA CUT US LOOSE. I TUNED IN TEB TWR. PLT SAID HE WOULD GO AROUND TEB. WE HAVE AN ARGUS ROVING MAP DISPLAY; I POINTED TO DISPLAY AND COMMENTED WE WOULD HAVE TO STAY OUTSIDE THE TEB AREA CIRCLE ON THE DISPLAY; HE AGREED. AT THAT TIME HE WAS ON A HDG TO GO AROUND TEB'S CLASS D. I PROCEEDED TO STUDY OUR CHART TO SEE WHAT OTHER CTL AREAS WE WOULD HAVE TO ENCOUNTER. OUR DEST WAS UNFAMILIAR TO US; SO WE WEREN'T SURE OF THE RTE. AS I WAS STUDYING THE CHART; I HEARD TEB TWR CALLING US OUT AS TFC TO AN ACFT WHO WAS LNDG AT TEB. I LOOKED UP SAW WE WERE INTO TEB CLASS D. TEB TWR CALLED US AND I RESPONDED. THEY INFORMED US WE WERE 3 MI FROM THEIR FIELD. WE WERE THEN GIVEN CLRNC THROUGH THEIR AREA. I HAVE NO IDEA WHY PLT DIDN'T GO AROUND CLASS D. I SHOULD HAVE PAID MORE ATTN OUTSIDE SINCE WE WERE SO CLOSE TO THEIR CLASS D. I COULD HAVE ALSO CONVINCED HIM TO TAKE THE MORE DIRECT RTE; CALLED TEB FOR CLRNC AND AVOIDED THE INCURSION.