Any Unknown or Unlisted Aircraft Manufacturer
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 40; Flight Crew Total 4800; Flight Crew Type 900
Communication Breakdown
Conflict NMAC
General None Reported / Taken
Human Factors; Airspace Structure; Procedure
While in a 'hold pattern' over the East River Exclusion at 1;000 FT we were south of the 6N5 heliport and just cleared to land. While turning and starting our descent to land there was a seaplane noticed at our 6 o'clock position about 200 FT lower than our altitude and the aircraft did not announce his position. I contacted LGA Tower Manager and informed him of this as well as 6N5 Manager and seaplane base 6N7. Possibly post a NOTAM for seaplane operators to adhere to their SOP for takeoff and landing in tight airspace and the requirement to transmit position within that corridor.
Helicopter First Officer landing at 6N5 reports an NMAC with a seaplane; not communicating his position and operating in the East River Exclusion.