Loss of traffic separation occurs when air carrier PIC claims he couldn't comply with amended route clearance from ATC account static encountered fromtstms on a WX avoidance maneuver.

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Attributes
ACN	145636
Time
Date	199005
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : orf
State Reference	VA
Altitude	msl bound lower : 23000 msl bound upper : 23000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc artcc : zse
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 20030 flight time type : 8000
ASRS Report	145636
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe inflight encounter : weather non adherence : clearance non adherence : required legal separation other anomaly other other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 800
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation other other

Narrative:

We had just departed norfolk, va and we had just found a hole to get through a line of thunderstorms. ATC cleared us to deviate as needed and then to proceed when able to flat rock VOR. Thus we proceeded to fly between 2 cells and as we proceeded there was static interference that limited our ability to receive radio transmission. ATC, in the meantime, decided that they wanted us to turn to heading (270 degrees) that was for traffic reasons, but we were still deviating for WX, and besides, we were still receiving so much static interference that we could barely understand them. I believe that in this case they lost control of the situation. You don't clear an aircraft to deviate through or around severe WX and then give them headings in the middle of things that they should know you can't follow. In our case, not only could we not do their bidding, but we couldn't hear them due to the interference. They should have just waited until we contacted them when we finished deviating.

Original NASA ASRS Text

Title: LOSS OF TRAFFIC SEPARATION OCCURS WHEN ACR PIC CLAIMS HE COULDN'T COMPLY WITH AMENDED ROUTE CLRNC FROM ATC ACCOUNT STATIC ENCOUNTERED FROMTSTMS ON A WX AVOIDANCE MANEUVER.

Narrative: WE HAD JUST DEPARTED NORFOLK, VA AND WE HAD JUST FOUND A HOLE TO GET THROUGH A LINE OF TSTMS. ATC CLRED US TO DEVIATE AS NEEDED AND THEN TO PROCEED WHEN ABLE TO FLAT ROCK VOR. THUS WE PROCEEDED TO FLY BTWN 2 CELLS AND AS WE PROCEEDED THERE WAS STATIC INTERFERENCE THAT LIMITED OUR ABILITY TO RECEIVE RADIO XMISSION. ATC, IN THE MEANTIME, DECIDED THAT THEY WANTED US TO TURN TO HDG (270 DEGS) THAT WAS FOR TFC REASONS, BUT WE WERE STILL DEVIATING FOR WX, AND BESIDES, WE WERE STILL RECEIVING SO MUCH STATIC INTERFERENCE THAT WE COULD BARELY UNDERSTAND THEM. I BELIEVE THAT IN THIS CASE THEY LOST CTL OF THE SITUATION. YOU DON'T CLR AN ACFT TO DEVIATE THROUGH OR AROUND SEVERE WX AND THEN GIVE THEM HDGS IN THE MIDDLE OF THINGS THAT THEY SHOULD KNOW YOU CAN'T FOLLOW. IN OUR CASE, NOT ONLY COULD WE NOT DO THEIR BIDDING, BUT WE COULDN'T HEAR THEM DUE TO THE INTERFERENCE. THEY SHOULD HAVE JUST WAITED UNTIL WE CONTACTED THEM WHEN WE FINISHED DEVIATING.

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.