DC10 captain reported on a wake turbulence incident while on the north atlantic route. Reporter cited an incident where an A340 was 1000 ft above them and in-trail 12 mi. Aircraft was under control of eggx.

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Attributes
ACN	370821
Time
Date	199706
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : eggx
State Reference	FO
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : eggx
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : atlantic enroute other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	A340
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : atlantic enroute : other oceanic enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 21000 flight time type : 1400
ASRS Report	370821
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

We picked up moderate wake turbulence from preceding aircraft at FL340 (airbus 340). We offset 1/2 mi to avoid turbulence. At time of encounter A340 was at 12 NM (my radar). Normal contrail and wake turbulence contrail was separate and distinct with wake contrail at our altitude. Callback conversation with reporter revealed the following information: reporter participated in the structured wake turbulence callback program.

Original NASA ASRS Text

Title: DC10 CAPT RPTED ON A WAKE TURB INCIDENT WHILE ON THE NORTH ATLANTIC RTE. RPTR CITED AN INCIDENT WHERE AN A340 WAS 1000 FT ABOVE THEM AND IN-TRAIL 12 MI. ACFT WAS UNDER CTL OF EGGX.

Narrative: WE PICKED UP MODERATE WAKE TURB FROM PRECEDING ACFT AT FL340 (AIRBUS 340). WE OFFSET 1/2 MI TO AVOID TURB. AT TIME OF ENCOUNTER A340 WAS AT 12 NM (MY RADAR). NORMAL CONTRAIL AND WAKE TURB CONTRAIL WAS SEPARATE AND DISTINCT WITH WAKE CONTRAIL AT OUR ALT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PARTICIPATED IN THE STRUCTURED WAKE TURB CALLBACK PROGRAM.

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.