<< >> NASA ASRS Report 235905, March 1993

Air carrier Y cleared to wrong VOR had less than standard separation from air carrier X. System error.

Attributes
ACN	235905
Time
Date	199303
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bkw
State Reference	WV
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid artcc : zhn
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 5 controller radar : 3
ASRS Report	235905
Person 2
Affiliation	government : faa
Function	controller : flight data
Qualification	controller : radar
Experience	controller military : 5 controller non radar : 6 controller radar : 3
ASRS Report	236615
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 25200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X on J42 level FL330 air carrier Y at FL350 direct gve. When lateral separation was established I cleared air carrier Y to FL330. I had several action vectors and told air carrier Y. 'If you were on a heading cleared direct bkw.' he responded, I believe we're going direct bkw now. I meant to say gve but mis-spoke. I noticed air carrier Y north of expect course and turned him 15 degrees right. I later turned him to 120 heading and air carrier X to a 060 heading. Supplemental information from acn 236615: air carrier Y was RNAV direct gve. Air carrier Y was told 'if you were left on a heading, cleared direct bkw.' pilot responded 'I think we're doing that already, direct bkw.' air carrier Y never corrected his statement. Air carrier X 6 mi off the aircraft's left wing then became in conflict.

Related reports:

• Air carrier X had less than standard separation from air car...
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Original NASA ASRS Text

Title: ACR Y CLRED TO WRONG VOR HAD LTSS FROM ACR X. SYS ERROR.

Narrative: ACR X ON J42 LEVEL FL330 ACR Y AT FL350 DIRECT GVE. WHEN LATERAL SEPARATION WAS ESTABLISHED I CLRED ACR Y TO FL330. I HAD SEVERAL ACTION VECTORS AND TOLD ACR Y. 'IF YOU WERE ON A HDG CLRED DIRECT BKW.' HE RESPONDED, I BELIEVE WE'RE GOING DIRECT BKW NOW. I MEANT TO SAY GVE BUT MIS-SPOKE. I NOTICED ACR Y N OF EXPECT COURSE AND TURNED HIM 15 DEGS R. I LATER TURNED HIM TO 120 HDG AND ACR X TO A 060 HDG. SUPPLEMENTAL INFO FROM ACN 236615: ACR Y WAS RNAV DIRECT GVE. ACR Y WAS TOLD 'IF YOU WERE LEFT ON A HDG, CLRED DIRECT BKW.' PLT RESPONDED 'I THINK WE'RE DOING THAT ALREADY, DIRECT BKW.' ACR Y NEVER CORRECTED HIS STATEMENT. ACR X 6 MI OFF THE ACFT'S L WING THEN BECAME IN CONFLICT.

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.