A giv captain, PNF, reported an near midair collision over jaymo with a bonanza.

Attributes
ACN	593072
Time
Date	200309
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : teb.airport
State Reference	NJ
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : n90.tracon
Operator	general aviation : personal
Make Model Name	Beech 1900
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	controller military : 20 controller radar : 24 flight time last 90 days : 100 flight time total : 6000 flight time type : 3000
ASRS Report	593072
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	vertical : 200
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared to jaymo and a descent to 2000 ft. Traffic called at 5 mi, 1:30 O'clock position at 1800 ft. Proceeding to jaymo at 2000 ft, traffic picked up on TCASII inside 5 mi, closing at 100 ft below (-01). Seconds later, first officer flying from left seat, gets a visual on aircraft at approximately 1/4 mi at an apparent co-altitude, closing. A TCASII command to 'climb' was received simultaneously. An abrupt climb was initiated to approximately 2300 ft to 2400 ft. The other aircraft appeared to take no evasive action and passed directly over jaymo at 1900-2000 ft.

Original NASA ASRS Text

Title: A GIV CAPT, PNF, RPTED AN NMAC OVER JAYMO WITH A BONANZA.

Narrative: CLRED TO JAYMO AND A DSCNT TO 2000 FT. TFC CALLED AT 5 MI, 1:30 O'CLOCK POS AT 1800 FT. PROCEEDING TO JAYMO AT 2000 FT, TFC PICKED UP ON TCASII INSIDE 5 MI, CLOSING AT 100 FT BELOW (-01). SECONDS LATER, FO FLYING FROM L SEAT, GETS A VISUAL ON ACFT AT APPROX 1/4 MI AT AN APPARENT CO-ALT, CLOSING. A TCASII COMMAND TO 'CLB' WAS RECEIVED SIMULTANEOUSLY. AN ABRUPT CLB WAS INITIATED TO APPROX 2300 FT TO 2400 FT. THE OTHER ACFT APPEARED TO TAKE NO EVASIVE ACTION AND PASSED DIRECTLY OVER JAYMO AT 1900-2000 FT.

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.