Near midair collision between a gulfstream iv, G4, descending to final ILS approach altitude and ano...

Attributes
ACN	377562
Time
Date	199708
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : teb
State Reference	NJ
Altitude	msl bound lower : 3200 msl bound upper : 4200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 tower : mci
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 11000 flight time type : 1800
ASRS Report	377562
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	other other : other pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 80 flight time total : 6000 flight time type : 1500
ASRS Report	377876
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

We were flying from stw direct to wanes (intersection) for the VOR/DME taxiway a approach to teb. We were working ny approach on 127.3 and the controller was very busy. We were descending to 3000 ft -- approach called out air carrier traffic above us, 11 O'clock position -- we had the traffic visually. However, out of 3500 ft we saw a TCASII target at 12 O'clock position, TCASII showed -500 ft and about 1 mi. I was slowing the descent to 1000 FPM for leveloff, TCASII called traffic, traffic. Other captain in right seat (I was left seat) could not find the VFR traffic, neither could I. In less than 3 seconds TCASII called climb, climb, climb -- TCASII display showed the traffic at 12 O'clock position and -100 ft. The bogy symbol was at the nose of our 'a' symbol on TCASII. I pushed power to 'go around' and pitched to 10 degrees. We never did see the VFR traffic. The G4 was light, minimum fuel and 2 passenger. The airplane climbed very quickly, I immediately started reducing power and pushed the nose to level. I saw 4200 ft on altimeter. Right seat pilot was on radio telling controller of our RA. I had the nose down, power off, and descending back to 3000 ft. Controller was very concerned we climbed higher than 500 ft to miss the traffic. He again called the air carrier which we had in sight and was not a factor for us. We were trying to avoid the VFR airplane which became a problem for us in less than 10 seconds after we first saw the TCASII target. The problem was how quick the VFR target became a threat, the fact he was 12 O'clock position, close and 100 ft below our altitude. We still had 200 ft to descend to our assigned 3000 ft. Seemed like a collision to me, and to TCASII, because it went from 'traffic' to 'climb, climb, climb' in less than 3 seconds. Problem was the G4 was light and climbed higher and faster than I had planned. Still, we were back at 3000 ft in about a min. The area was very busy with VFR and IFR traffic but the rest of the approach and landing was uneventful. The controller was busy but was doing a good job of controling. I am still not sure he knew how very close the VFR traffic was to our airplane.

Original NASA ASRS Text

Title: NMAC BTWN A GULFSTREAM IV, G4, DSNDING TO FINAL ILS APCH ALT AND ANOTHER VFR ACFT CLBING THROUGH THE ALT TO WHICH THEY WERE DSNDING. THE G4 MADE A HIGH RATE OF CLB TO AVOID A COLLISION.

Narrative: WE WERE FLYING FROM STW DIRECT TO WANES (INTXN) FOR THE VOR/DME TXWY A APCH TO TEB. WE WERE WORKING NY APCH ON 127.3 AND THE CTLR WAS VERY BUSY. WE WERE DSNDING TO 3000 FT -- APCH CALLED OUT ACR TFC ABOVE US, 11 O'CLOCK POS -- WE HAD THE TFC VISUALLY. HOWEVER, OUT OF 3500 FT WE SAW A TCASII TARGET AT 12 O'CLOCK POS, TCASII SHOWED -500 FT AND ABOUT 1 MI. I WAS SLOWING THE DSCNT TO 1000 FPM FOR LEVELOFF, TCASII CALLED TFC, TFC. OTHER CAPT IN R SEAT (I WAS L SEAT) COULD NOT FIND THE VFR TFC, NEITHER COULD I. IN LESS THAN 3 SECONDS TCASII CALLED CLB, CLB, CLB -- TCASII DISPLAY SHOWED THE TFC AT 12 O'CLOCK POS AND -100 FT. THE BOGY SYMBOL WAS AT THE NOSE OF OUR 'A' SYMBOL ON TCASII. I PUSHED PWR TO 'GAR' AND PITCHED TO 10 DEGS. WE NEVER DID SEE THE VFR TFC. THE G4 WAS LIGHT, MINIMUM FUEL AND 2 PAX. THE AIRPLANE CLBED VERY QUICKLY, I IMMEDIATELY STARTED REDUCING PWR AND PUSHED THE NOSE TO LEVEL. I SAW 4200 FT ON ALTIMETER. R SEAT PLT WAS ON RADIO TELLING CTLR OF OUR RA. I HAD THE NOSE DOWN, PWR OFF, AND DSNDING BACK TO 3000 FT. CTLR WAS VERY CONCERNED WE CLBED HIGHER THAN 500 FT TO MISS THE TFC. HE AGAIN CALLED THE ACR WHICH WE HAD IN SIGHT AND WAS NOT A FACTOR FOR US. WE WERE TRYING TO AVOID THE VFR AIRPLANE WHICH BECAME A PROB FOR US IN LESS THAN 10 SECONDS AFTER WE FIRST SAW THE TCASII TARGET. THE PROB WAS HOW QUICK THE VFR TARGET BECAME A THREAT, THE FACT HE WAS 12 O'CLOCK POS, CLOSE AND 100 FT BELOW OUR ALT. WE STILL HAD 200 FT TO DSND TO OUR ASSIGNED 3000 FT. SEEMED LIKE A COLLISION TO ME, AND TO TCASII, BECAUSE IT WENT FROM 'TFC' TO 'CLB, CLB, CLB' IN LESS THAN 3 SECONDS. PROB WAS THE G4 WAS LIGHT AND CLBED HIGHER AND FASTER THAN I HAD PLANNED. STILL, WE WERE BACK AT 3000 FT IN ABOUT A MIN. THE AREA WAS VERY BUSY WITH VFR AND IFR TFC BUT THE REST OF THE APCH AND LNDG WAS UNEVENTFUL. THE CTLR WAS BUSY BUT WAS DOING A GOOD JOB OF CTLING. I AM STILL NOT SURE HE KNEW HOW VERY CLOSE THE VFR TFC WAS TO OUR AIRPLANE.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Near midair collision between a gulfstream iv, G4, descending to final ILS approach altitude and another VFR aircraft climbing through the altitude to which they were descending. The G4 made a high rate of climb to avoid a collision.