Air carrier carj flight crew initiates evasive maneuver from another air carrier when passing in close proximity as both acrs were assigned the same altitude by ZID.

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Attributes
ACN	451464
Time
Date	199910
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : vhp.vor
State Reference	IN
Altitude	msl single value : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Challenger CL604
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute other
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 : enroute altitude change
Route In Use	enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine pilot : private pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 1550 flight time type : 550
ASRS Report	451464
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne critical
Independent Detector	other flight crewa other flight crewb
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 15000 vertical : 600
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We (aircraft X) were cleared to climb FL270 (read back altitude clearance). Upon leveloff, got TCASII TA, then RA, RA to descend and monitor vertical speed. Captain had visual contact with an air carrier while adhering to RA. ATC then notified us of traffic, then we advised ATC of conflict and that captain had aircraft in sight. Other air carrier pilot did the same. Other air carrier apparently was cleared to FL270 as well. Later, we were told ATC mistakenly cleared us both to FL270.

Original NASA ASRS Text

Title: ACR CARJ FLC INITIATES EVASIVE MANEUVER FROM ANOTHER ACR WHEN PASSING IN CLOSE PROX AS BOTH ACRS WERE ASSIGNED THE SAME ALT BY ZID.

Narrative: WE (ACFT X) WERE CLRED TO CLB FL270 (READ BACK ALT CLRNC). UPON LEVELOFF, GOT TCASII TA, THEN RA, RA TO DSND AND MONITOR VERT SPD. CAPT HAD VISUAL CONTACT WITH AN ACR WHILE ADHERING TO RA. ATC THEN NOTIFIED US OF TFC, THEN WE ADVISED ATC OF CONFLICT AND THAT CAPT HAD ACFT IN SIGHT. OTHER ACR PLT DID THE SAME. OTHER ACR APPARENTLY WAS CLRED TO FL270 AS WELL. LATER, WE WERE TOLD ATC MISTAKENLY CLRED US BOTH TO FL270.

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.