Air carrier X NORDO aircraft equipment problem radio. Air carrier X potential less than standard sep...

Attributes
ACN	197663
Time
Date	199112
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : gck
State Reference	KS
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct
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 descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	197663
Person 2
Affiliation	government : faa
Function	oversight : supervisor
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 33000 vertical : 2000
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Sector 22 had track control of air carrier X from approximately 20 mi southeast gage, ok. Air carrier X was NORDO (no radio contact) and had been since southwest of gag. Air carrier X was nwbound at FL350. Air carrier Y was on frequency at FL350 wbound. I also observed the potential confliction between air carrier X and air carrier Y several mins prior to the confliction point. I expected radio contact with air carrier X crossing the R22-R23 boundary at the latest. I did not receive radio contact with air carrier X until laa. After observing for a time I turned air carrier Y to a 180 heading for traffic. Air carrier Y opted for a turn over a descent for the traffic. While air carrier Y was still executing the turn I was ordered by supervisor to descend air carrier Y. Air carrier Y was issued additional turns in order for the descent to provide separation between air carrier Y and air carrier X. Air carrier Y had air carrier X in sight from about 12 mi and he reported level FL330 approximately 5.5 mi from air carrier X. Initial vector would have provided separation. By descending air carrier Y his turn rate was slowed causing additional control instructions to be required to ensure separation.

Original NASA ASRS Text

Title: ACR X NORDO ACFT EQUIP PROBLEM RADIO. ACR X POTENTIAL LTSS FROM ACR Y. POTENTIAL SYS ERROR.

Narrative: SECTOR 22 HAD TRACK CTL OF ACR X FROM APPROX 20 MI SE GAGE, OK. ACR X WAS NORDO (NO RADIO CONTACT) AND HAD BEEN SINCE SW OF GAG. ACR X WAS NWBOUND AT FL350. ACR Y WAS ON FREQ AT FL350 WBOUND. I ALSO OBSERVED THE POTENTIAL CONFLICTION BTWN ACR X AND ACR Y SEVERAL MINS PRIOR TO THE CONFLICTION POINT. I EXPECTED RADIO CONTACT WITH ACR X XING THE R22-R23 BOUNDARY AT THE LATEST. I DID NOT RECEIVE RADIO CONTACT WITH ACR X UNTIL LAA. AFTER OBSERVING FOR A TIME I TURNED ACR Y TO A 180 HDG FOR TFC. ACR Y OPTED FOR A TURN OVER A DSCNT FOR THE TFC. WHILE ACR Y WAS STILL EXECUTING THE TURN I WAS ORDERED BY SUPVR TO DSND ACR Y. ACR Y WAS ISSUED ADDITIONAL TURNS IN ORDER FOR THE DSCNT TO PROVIDE SEPARATION BTWN ACR Y AND ACR X. ACR Y HAD ACR X IN SIGHT FROM ABOUT 12 MI AND HE RPTED LEVEL FL330 APPROX 5.5 MI FROM ACR X. INITIAL VECTOR WOULD HAVE PROVIDED SEPARATION. BY DSNDING ACR Y HIS TURN RATE WAS SLOWED CAUSING ADDITIONAL CTL INSTRUCTIONS TO BE REQUIRED TO ENSURE SEPARATION.

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.

Air carrier X NORDO aircraft equipment problem radio. Air carrier X potential less than standard separation from air carrier Y. Potential system error.