Loss of separation in the class a of ZID during a radar outage.

Attributes
ACN	490764
Time
Date	200010
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : hnn.vortac
State Reference	WV
Altitude	msl bound lower : 33000 msl bound upper : 34000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	general aviation : corporate
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : cfi pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 18000 flight time type : 8000
ASRS Report	490764
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	conflict : airborne critical non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : returned to assigned altitude flight crew : took evasive action
Miss Distance	vertical : 700
Supplementary
Problem Areas	ATC Human Performance ATC Facility
Primary Problem	ATC Facility
Air Traffic Incident	Operational Error
Situations
ATC Facility	radar equipment : zid.artcc

Narrative:

We were advised by ZID that radar was out. Mins later we received an RA on our TCASII and climbed to FL340 and advised ZID. Passed over top a sebound learjet by about 700 ft. Returned to FL330 and continued flight in non radar environment until we got into ZOB's airspace.

Original NASA ASRS Text

Title: LOSS OF SEPARATION IN THE CLASS A OF ZID DURING A RADAR OUTAGE.

Narrative: WE WERE ADVISED BY ZID THAT RADAR WAS OUT. MINS LATER WE RECEIVED AN RA ON OUR TCASII AND CLBED TO FL340 AND ADVISED ZID. PASSED OVER TOP A SEBOUND LEARJET BY ABOUT 700 FT. RETURNED TO FL330 AND CONTINUED FLT IN NON RADAR ENVIRONMENT UNTIL WE GOT INTO ZOB'S AIRSPACE.

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.