A DC8 and a commuter aircraft at the same altitude were deviating for WX. The ARTCC radar controller thought that one aircraft had been cleared above the other aircraft. One aircraft specified a 220 degree heading for WX deviation, but reporter believes that the aircraft was actually tracking 250 degrees.

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Attributes
ACN	372923
Time
Date	199706
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : vwv
State Reference	OH
Altitude	msl bound lower : 13000 msl bound upper : 13000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	DC-8 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : flight data
Qualification	controller : radar
Experience	controller radar : 15
ASRS Report	372923
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar pilot : instrument
Experience	controller radar : 12 flight time total : 2100
ASRS Report	373062
Events
Anomaly	conflict : airborne less severe inflight encounter : weather non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 21000 vertical : 150
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Both aircraft deviating. Radar controller didn't climb either aircraft, consequently they lost separation. Supplemental information from acn 373062: WX caused deviations in aircraft flight paths. Controller believed aircraft #1 had been cleared to climb above aircraft #2. Aircraft #2 had specified a deviation heading of 220 degrees. Aircraft #2 was actually tracking about 250 degrees.

Original NASA ASRS Text

Title: A DC8 AND A COMMUTER ACFT AT THE SAME ALT WERE DEVIATING FOR WX. THE ARTCC RADAR CTLR THOUGHT THAT ONE ACFT HAD BEEN CLRED ABOVE THE OTHER ACFT. ONE ACFT SPECIFIED A 220 DEG HDG FOR WX DEV, BUT RPTR BELIEVES THAT THE ACFT WAS ACTUALLY TRACKING 250 DEGS.

Narrative: BOTH ACFT DEVIATING. RADAR CTLR DIDN'T CLB EITHER ACFT, CONSEQUENTLY THEY LOST SEPARATION. SUPPLEMENTAL INFO FROM ACN 373062: WX CAUSED DEVS IN ACFT FLT PATHS. CTLR BELIEVED ACFT #1 HAD BEEN CLRED TO CLB ABOVE ACFT #2. ACFT #2 HAD SPECIFIED A DEV HDG OF 220 DEGS. ACFT #2 WAS ACTUALLY TRACKING ABOUT 250 DEGS.

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.