B757 captain reports arriving at 30 west on track C two minutes past the ETA and noting the actual w...

Narrative:

I was the pilot flying. After passing 30 west on track 'C'; I noticed the air traffic area at 30 west was two minutes later than the ETA. Comparing the displayed winds alongside the winds loaded in the FMC showed a variance. Not remarkable; yet enough to prompt further investigation. Though well before the next scheduled wind update at XA00Z; I sent for new winds. The uplink took an inordinate amount of time to arrive. Upon execution of the update; sure enough; the winds had changed.prior to 40 west a crew rest change-over would occur (relief pilot was coming on-duty); drinks were to be served; along with a quick restroom break. The first officer completed the 'approaching waypoint procedure' and handed me the flight plan to complete the pilot monitoring duties prior to the relief pilot beginning this function. Passing the waypoint I recorded a three minute air traffic area variance from the 40 west ETA sent to gander. The ETA change was not noticed when the new winds were loaded; but obviously had changed at some point between execution of the wind uplink and 40 west.

Original NASA ASRS Text

Title: B757 Captain reports arriving at 30 west on Track C two minutes past the ETA and noting the actual wind is different from the FMC stored wind. New winds are requested and entered in the FMC. Crossing 40 west the time is three minutes different from the ETA.

Narrative: I was the pilot flying. After passing 30 west on track 'C'; I noticed the ATA at 30 west was two minutes later than the ETA. Comparing the displayed winds alongside the winds loaded in the FMC showed a variance. Not remarkable; yet enough to prompt further investigation. Though well before the next scheduled wind update at XA00Z; I sent for new winds. The uplink took an inordinate amount of time to arrive. Upon execution of the update; sure enough; the winds had changed.Prior to 40 west a crew rest change-over would occur (Relief pilot was coming on-duty); drinks were to be served; along with a quick restroom break. The First Officer completed the 'approaching waypoint procedure' and handed me the flight plan to complete the pilot monitoring duties prior to the Relief pilot beginning this function. Passing the waypoint I recorded a three minute ATA variance from the 40 west ETA sent to Gander. The ETA change was not noticed when the new winds were loaded; but obviously had changed at some point between execution of the wind uplink and 40 west.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1276894
Time
Date	201507
Place
Locale Reference	CZQX.ARTCC
State Reference	NF
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Oceanic
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Experience	Flight Crew Last 90 Days 153 Flight Crew Total 4609 Flight Crew Type 2656
Events
Anomaly	Deviation - Procedural Published Material / Policy Inflight Event / Encounter Weather / Turbulence

B757 captain reports arriving at 30 west on track C two minutes past the ETA and noting the actual wind is different from the FMC stored wind. New winds are requested and entered in the FMC. Crossing 40 west the time is three minutes different from the ETA.