Flight crew of a widebody transport air carrier aircraft failed to follow the clearance route during an oceanic route resulting in ARTCC intervention to bring the aircraft back to assigned route.

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Attributes
ACN	248518
Time
Date	199307
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cyyt
State Reference	NF
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : atlantic enroute airway : czqx
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer
ASRS Report	248518
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At cruise we requested oceanic clearance via ACARS. We had requested track 'V' which included bancs, 46 north/50 west. What we received was the following clearance. 'Air carrier flight number, cleared to lfpg via bancs route 45/50, 48/40, 50/30, 50/20, 50/15 kenuk expect FL310 mach .830.' the PNF read back the clearance as follows 'air carrier flight number, cleared track 'V' bancs 45N/50W, 48N/40W, 50N/30W, 50N/20W, 50N/15W kenuk expect FL310 mach .83.' after bancs we were proceeding to 46N/50W when center called and asked where we were heading. The misunderstanding was cleared up and we proceeded to 45N/50W as cleared. The confusion came in the clearance given. The word via was confused with track 'V' and the point bancs was a route point on track 'V' as well. In the future, a rerte received via ACARS could be or better yet, should be specifically addressed with the words rerte.

Original NASA ASRS Text

Title: FLC OF A WDB ACR ACFT FAILED TO FOLLOW THE CLRNC RTE DURING AN OCEANIC RTE RESULTING IN ARTCC INTERVENTION TO BRING THE ACFT BACK TO ASSIGNED RTE.

Narrative: AT CRUISE WE REQUESTED OCEANIC CLRNC VIA ACARS. WE HAD REQUESTED TRACK 'V' WHICH INCLUDED BANCS, 46 N/50 W. WHAT WE RECEIVED WAS THE FOLLOWING CLRNC. 'ACR FLT NUMBER, CLRED TO LFPG VIA BANCS RTE 45/50, 48/40, 50/30, 50/20, 50/15 KENUK EXPECT FL310 MACH .830.' THE PNF READ BACK THE CLRNC AS FOLLOWS 'ACR FLT NUMBER, CLRED TRACK 'V' BANCS 45N/50W, 48N/40W, 50N/30W, 50N/20W, 50N/15W KENUK EXPECT FL310 MACH .83.' AFTER BANCS WE WERE PROCEEDING TO 46N/50W WHEN CTR CALLED AND ASKED WHERE WE WERE HEADING. THE MISUNDERSTANDING WAS CLRED UP AND WE PROCEEDED TO 45N/50W AS CLRED. THE CONFUSION CAME IN THE CLRNC GIVEN. THE WORD VIA WAS CONFUSED WITH TRACK 'V' AND THE POINT BANCS WAS A RTE POINT ON TRACK 'V' AS WELL. IN THE FUTURE, A RERTE RECEIVED VIA ACARS COULD BE OR BETTER YET, SHOULD BE SPECIFICALLY ADDRESSED WITH THE WORDS RERTE.

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.