Near midair collision between a gulfstream V descending back to altitude from which previously cleared by ARTCC controller, and an unknown aircraft passing over at 500 ft according to TCASII.

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Attributes
ACN	515051
Time
Date	200106
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : vhp.vortac
State Reference	IN
Altitude	msl bound lower : 26000 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc artcc : zla.artcc
Operator	general aviation : corporate
Make Model Name	Gulfstream V
Operating Under FAR Part	Part 91
Navigation In Use	other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 5000 flight time type : 500
ASRS Report	515051
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : nmac non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	controller : separated traffic controller : issued new clearance none taken : detected after the fact
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error other

Narrative:

ZID instructed gv to climb from FL260 to FL280. During the initial part of the climb, the controller instructed us to return to FL260. At this time the TCASII activated as an RA. We initiated the descent to FL260. Another aircraft passed over during our descent to FL260. The controller said nothing of the incident. The rest of the flight continued without incident.

Original NASA ASRS Text

Title: NMAC BTWN A GULFSTREAM V DSNDING BACK TO ALT FROM WHICH PREVIOUSLY CLRED BY ARTCC CTLR, AND AN UNKNOWN ACFT PASSING OVER AT 500 FT ACCORDING TO TCASII.

Narrative: ZID INSTRUCTED GV TO CLB FROM FL260 TO FL280. DURING THE INITIAL PART OF THE CLB, THE CTLR INSTRUCTED US TO RETURN TO FL260. AT THIS TIME THE TCASII ACTIVATED AS AN RA. WE INITIATED THE DSCNT TO FL260. ANOTHER ACFT PASSED OVER DURING OUR DSCNT TO FL260. THE CTLR SAID NOTHING OF THE INCIDENT. THE REST OF THE FLT CONTINUED WITHOUT INCIDENT.

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.