Date: 201306
Local time of day: 1201-1800
Location: TEB.Airport, NJ
Flight conditions: VMC
Light: Daylight
Aircraft: Gulfstream V / G500 / G550
Operator: Air Taxi
Operating under: Part 91
Flight plan: IFR
Mission: Ferry / Re-Positioning
Flight phase: Initial Approach
Airspace: Class E ZNY
ATC / advisory: TRACON N90
Reporter organization: Air Taxi
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Anomaly: Conflict Airborne Conflict
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Became Reoriented
Contributing factors: Procedure; Airspace Structure
Primary problem: Airspace Structure

Narrative: On arrival to TEB on the WILKES BARRE 4 STAR and approximately 2 minutes prior to reaching MUGZY at 6;000 MSL and 250 KIAS; we overheard a G-V preceding us on this arrival transmit to TRACON that 'we just came very; very close to a glider at MUGZY at 6;000 FT'. They were then given a normal vector towards the airport. As we approached MUGZY; the pilot flying pointed out a glider at our 11 o'clock and same altitude. I also spotted the aircraft (white; low wing and probably single seat) in a right hand orbit. We passed behind it (south of its position) at the above listed approximately distance. Passing MUGZY we were given a normal radar vector to the east towards the TEB Runway 19 final. I acknowledged this vector and reported the glider encounter. A few seconds later I noticed another glider to our right approximately the same horizontal distance and about 1;000 FT below us. We passed this aircraft north of its position. I also reported this aircraft to the very busy Controller who responded with 'we can't see them'. Evasive action was not required. We then continued the approach and landing at TEB. Both the pilot flying and I have been flying into TEB for 20-30 years. The pilot flying was even based there for a few years. We both agreed that we were totally unaware of glider operations in this area. We also both agreed that had we been given the same vector 10-15 seconds earlier; the outcome of this event may have been very different. I researched the pubs and the only mention I could find was a symbol on the VFR Sectional indicating glider operations in this area. We of course always operate under IFR and don't use this chart. There is also no mention of high speed IFR traffic in this area depicted on this chart; even though V226 coincides with this arrival routing. A similar arrival route is just south of this one for traffic inbound to EWR. I researched the pubs for airports in this area that might have glider traffic and found that 1N7 has over 50 gliders based there. This airport is approximately 5 NM south southwest of MUGZY. I was able to speak with one of the locally based glider pilots. He stated that many nearby airports also have glider operations; and while they are probably unfamiliar with MUGZY or the STAR; (MUGZY is only depicted on the STAR) they should be aware of the need to avoid loitering in this area. He stated however that sometimes they may get 'stuck' at this altitude. He also stated this area transitions several popular glider courses. He stated that few of the gliders are transponder equipped; but if so they should be squawking 1202 for ATC purposes. Of course when it's busy; TRACON is likely and understandably filtering out VFR targets they are not working. He offered to share this experience with his fellow glider pilots and also provided me with a CTAF they use for air-to-air SA in this area. (123.3) we will be vigilant for this additional see and avoid hazard and will encourage our company to disseminate this info to all aircrews. Hopefully they can also influence changes to both the IFR and VFR charts for this area as well. Due to ATC and TCAS inability to detect these aircraft and the normal procedure of high speed IFR traffic operating near and through VFR altitudes in this area; it would seem useful to add a note about this activity on the STAR. (There is room on the chart). Additionally; a note about the nearby STAR's with routing and traffic type descriptions could be added to the VFR charts as well. I happened upon the crew of the G-V that preceded us because I overheard them talking about it at the FBO. They were quite concerned not only about their encounter; but by the lack of info about this activity. They stated they were experienced at TEB; but had also never been previously aware of glider operations in this area. We all know the airspace and charts are busy in this area; but this seems to be an activity that few may be aware of yet all have a very definite need to be.




Synopsis: G-V First Officer discovers extensive glider activity near MUGZY on the WILKES BARRE 4 STAR to TEB.