ARTCC radar controller's transmitter receiver control panel failed.

Attributes
ACN	149372
Time
Date	199006
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mkg
State Reference	MI
Altitude	msl bound lower : 24000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	general aviation : corporate
Make Model Name	Medium Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	149372
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 30000 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other
Situations
ATC Facility	other physical facility

Narrative:

Primary transmitter and receiver control panel malfunctioned. Began using backup frequency temporarily. Subsequently the primary receiver/transmitter checked out satisfactorily and a message was sent to all concerned to use primary frequency. 1 aircraft (mdt) was switched to the backup west/O my knowledge. When backup was turned off, mdt was now NORDO climbing to FL290 head-on with 240 degree traffic. The medium large transport was turned to a 220 degree heading to avoid the head-on situation--about a 100 degree turn. The aircraft passed as closely as noted above.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR'S TRANSMITTER RECEIVER CONTROL PANEL FAILED.

Narrative: PRIMARY XMITTER AND RECEIVER CTL PANEL MALFUNCTIONED. BEGAN USING BACKUP FREQ TEMPORARILY. SUBSEQUENTLY THE PRIMARY RECEIVER/XMITTER CHKED OUT SATISFACTORILY AND A MESSAGE WAS SENT TO ALL CONCERNED TO USE PRIMARY FREQ. 1 ACFT (MDT) WAS SWITCHED TO THE BACKUP W/O MY KNOWLEDGE. WHEN BACKUP WAS TURNED OFF, MDT WAS NOW NORDO CLBING TO FL290 HEAD-ON WITH 240 DEG TFC. THE MLG WAS TURNED TO A 220 DEG HDG TO AVOID THE HEAD-ON SITUATION--ABOUT A 100 DEG TURN. THE ACFT PASSED AS CLOSELY AS NOTED ABOVE.

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.