Lear LR60 flight crew has a track and or heading deviation during oceanic transit.

Attributes
ACN	725906
Time
Date	200701
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zny.artcc
State Reference	NY
Altitude	msl single value : 38000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : charter
Make Model Name	Learjet 60
Operating Under FAR Part	Part 135
Flight Phase	cruise : level
Route In Use	enroute : atlantic
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 320 flight time total : 6300 flight time type : 2100
ASRS Report	725900
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	controller non radar : 6 controller radar : 14 flight time last 90 days : 150 flight time total : 4500 flight time type : 500
ASRS Report	725534
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : overcame equipment problem flight crew : returned to intended or assigned course
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

We took off from bermuda (txkf) in a lear 60. At cruise FL380 we made our normal position reports. The only thing that stuck out was midway through the flight the wind direction and readout of about 90 KT headwind was no longer visible; on the mfd (multi-function display). We thought it was odd that the wind went calm all of a sudden. New york oceanic gave us a frequency to contact miami 5 mins outside sumrs intersection. The other thing that caught our attention was when new york oceanic asked us several times to verify our times and speed. 5 mins outside of sumrs intersection and then again over sumrs intersection; we could not raise ZMA except through another aircraft relay. When our aircraft FMS told us we were over nucar miami advised us that if we were over nucar they would be able to see us on radar. We then knew something was wrong. Then miami said they had us a little while later but 10 mi outside nucar. We reinitialized our #2 FMS in-flight and had no other deviation. It seems to me the wind readout was no longer compensating for the headwind putting the aircraft farther behind then it was showing on the mfd.

Original NASA ASRS Text

Title: LEAR LR60 FLT CREW HAS A TRACK AND OR HDG DEV DURING OCEANIC TRANSIT.

Narrative: WE TOOK OFF FROM BERMUDA (TXKF) IN A LEAR 60. AT CRUISE FL380 WE MADE OUR NORMAL POS RPTS. THE ONLY THING THAT STUCK OUT WAS MIDWAY THROUGH THE FLT THE WIND DIRECTION AND READOUT OF ABOUT 90 KT HEADWIND WAS NO LONGER VISIBLE; ON THE MFD (MULTI-FUNCTION DISPLAY). WE THOUGHT IT WAS ODD THAT THE WIND WENT CALM ALL OF A SUDDEN. NEW YORK OCEANIC GAVE US A FREQ TO CONTACT MIAMI 5 MINS OUTSIDE SUMRS INTXN. THE OTHER THING THAT CAUGHT OUR ATTN WAS WHEN NEW YORK OCEANIC ASKED US SEVERAL TIMES TO VERIFY OUR TIMES AND SPD. 5 MINS OUTSIDE OF SUMRS INTXN AND THEN AGAIN OVER SUMRS INTXN; WE COULD NOT RAISE ZMA EXCEPT THROUGH ANOTHER ACFT RELAY. WHEN OUR ACFT FMS TOLD US WE WERE OVER NUCAR MIAMI ADVISED US THAT IF WE WERE OVER NUCAR THEY WOULD BE ABLE TO SEE US ON RADAR. WE THEN KNEW SOMETHING WAS WRONG. THEN MIAMI SAID THEY HAD US A LITTLE WHILE LATER BUT 10 MI OUTSIDE NUCAR. WE REINITIALIZED OUR #2 FMS INFLT AND HAD NO OTHER DEV. IT SEEMS TO ME THE WIND READOUT WAS NO LONGER COMPENSATING FOR THE HEADWIND PUTTING THE ACFT FARTHER BEHIND THEN IT WAS SHOWING ON THE MFD.

Data retrieved from NASA's ASRS site as of January 2009 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.