A B767 flight crew was advised to proceed to a fix not on the FMC route in gander airspace.

Attributes
ACN	457140
Time
Date	199912
Day	Sun
Local Time Of Day	1201 To 1800
Place
State Reference	NF
Altitude	msl single value : 39000
Environment
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : czqx.artcc
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute : atlantic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	457140
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	457139
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended or assigned course
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At XA41Z position yyt, aircraft X contacted gander center to confirm radar contact. Center confirmed radar contact and shortly after issued clearance to climb to FL390 as requested. At XA41Z after frequency change to 125.25, gander center contacted aircraft X to confirm course direct tusky. FMC was programmed direct plymm. A 2 degree correction to the right of course put aircraft X on course direct tusky. No further discussion ensued after confirmation to gander center that aircraft X was proceeding direct tusky direct plymm. Route and legs were confirmed prior to departure as per FMC procedure. Still unsure how or why tusky dropped out. Supplemental information from acn 457139: during preflight both route and legs were verified and stepped through by the captain and first officer. The waypoint tusky had somehow been eliminated from the active route.

Original NASA ASRS Text

Title: A B767 FLC WAS ADVISED TO PROCEED TO A FIX NOT ON THE FMC RTE IN GANDER AIRSPACE.

Narrative: AT XA41Z POS YYT, ACFT X CONTACTED GANDER CTR TO CONFIRM RADAR CONTACT. CTR CONFIRMED RADAR CONTACT AND SHORTLY AFTER ISSUED CLRNC TO CLB TO FL390 AS REQUESTED. AT XA41Z AFTER FREQ CHANGE TO 125.25, GANDER CTR CONTACTED ACFT X TO CONFIRM COURSE DIRECT TUSKY. FMC WAS PROGRAMMED DIRECT PLYMM. A 2 DEG CORRECTION TO THE R OF COURSE PUT ACFT X ON COURSE DIRECT TUSKY. NO FURTHER DISCUSSION ENSUED AFTER CONFIRMATION TO GANDER CTR THAT ACFT X WAS PROCEEDING DIRECT TUSKY DIRECT PLYMM. RTE AND LEGS WERE CONFIRMED PRIOR TO DEP AS PER FMC PROC. STILL UNSURE HOW OR WHY TUSKY DROPPED OUT. SUPPLEMENTAL INFO FROM ACN 457139: DURING PREFLT BOTH RTE AND LEGS WERE VERIFIED AND STEPPED THROUGH BY THE CAPT AND FO. THE WAYPOINT TUSKY HAD SOMEHOW BEEN ELIMINATED FROM THE ACTIVE RTE.

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.