G5 crew receives TCASII RA as they pass beneath climbing air carrier aircraft in N90 airspace.

Attributes
ACN	420697
Time
Date	199811
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sak
State Reference	NJ
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90
Operator	general aviation : corporate
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial
Experience	flight time last 90 days : 125 flight time total : 8922 flight time type : 25
ASRS Report	420697
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were cleared to and maintaining 11000 ft, having been advised there was a commuter climbing above us. They had just vacated 11000 ft, and were climbing through 11500 ft or so (maybe 11600 ft) when we flew under them along the same general route of flight. Our TCASII gave a descend command, which I did not comply with because I knew why we had gotten it. I think the controller may not have allowed enough time and distance for the commuter to climb above us before we arrived in that airspace at a faster speed.

Original NASA ASRS Text

Title: G5 CREW RECEIVES TCASII RA AS THEY PASS BENEATH CLBING ACR ACFT IN N90 AIRSPACE.

Narrative: WE WERE CLRED TO AND MAINTAINING 11000 FT, HAVING BEEN ADVISED THERE WAS A COMMUTER CLBING ABOVE US. THEY HAD JUST VACATED 11000 FT, AND WERE CLBING THROUGH 11500 FT OR SO (MAYBE 11600 FT) WHEN WE FLEW UNDER THEM ALONG THE SAME GENERAL RTE OF FLT. OUR TCASII GAVE A DSND COMMAND, WHICH I DID NOT COMPLY WITH BECAUSE I KNEW WHY WE HAD GOTTEN IT. I THINK THE CTLR MAY NOT HAVE ALLOWED ENOUGH TIME AND DISTANCE FOR THE COMMUTER TO CLB ABOVE US BEFORE WE ARRIVED IN THAT AIRSPACE AT A FASTER SPD.

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.