Gross navigation error.

Attributes
ACN	208499
Time
Date	199204
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : jfk
State Reference	NY
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : atlantic enroute : other oceanic enroute airway : zny
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 255 flight time total : 10000 flight time type : 3000
ASRS Report	208499
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : atp pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 4500 flight time type : 1200
ASRS Report	208497
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : reviewed incident with flight crew faa : investigated
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Departed bermuda en route to ewr. At reporting point flann (fix) nyc reports our position as being 63 mi east of the flann intersection. Autoplt coupled to #1 omega #2 VOR was centered on jfk radial departing flann intersection and concurring with DME readout. Nyc directed flight to turn left to heading 270 degrees in which we did. At this point, we verified proper waypoint coordinates and insertion into omega. Captain made logbook entry for maintenance to inspect both omega system. Supplemental information from acn 208497: ny then asked for our position coordinates and what type of navigation we were equipped with. Upon reporting our indicated coordinates. Center stated their coordinates differed with ours. Center stated a report would be filed and that our maintenance should inspect the omegas. Supplemental information from acn 208394: waypoint programming was verified. All omega and autoplt actions were back- traced by flight crew to verify, and to identify possible errors. Neither I nor either of the other 2 flight crew members could determine the reason that we showed off-course by radar upon contact over flann. I wrote up both omega units for maintenance inspection as having been reported 63 mi off-course by ATC.

Original NASA ASRS Text

Title: GROSS NAV ERROR.

Narrative: DEPARTED BERMUDA ENRTE TO EWR. AT RPTING POINT FLANN (FIX) NYC RPTS OUR POS AS BEING 63 MI E OF THE FLANN INTXN. AUTOPLT COUPLED TO #1 OMEGA #2 VOR WAS CTRED ON JFK RADIAL DEPARTING FLANN INTXN AND CONCURRING WITH DME READOUT. NYC DIRECTED FLT TO TURN L TO HDG 270 DEGS IN WHICH WE DID. AT THIS POINT, WE VERIFIED PROPER WAYPOINT COORDINATES AND INSERTION INTO OMEGA. CAPT MADE LOGBOOK ENTRY FOR MAINT TO INSPECT BOTH OMEGA SYS. SUPPLEMENTAL INFO FROM ACN 208497: NY THEN ASKED FOR OUR POS COORDINATES AND WHAT TYPE OF NAV WE WERE EQUIPPED WITH. UPON RPTING OUR INDICATED COORDINATES. CTR STATED THEIR COORDINATES DIFFERED WITH OURS. CTR STATED A RPT WOULD BE FILED AND THAT OUR MAINT SHOULD INSPECT THE OMEGAS. SUPPLEMENTAL INFO FROM ACN 208394: WAYPOINT PROGRAMMING WAS VERIFIED. ALL OMEGA AND AUTOPLT ACTIONS WERE BACK- TRACED BY FLC TO VERIFY, AND TO IDENT POSSIBLE ERRORS. NEITHER I NOR EITHER OF THE OTHER 2 FLC MEMBERS COULD DETERMINE THE REASON THAT WE SHOWED OFF-COURSE BY RADAR UPON CONTACT OVER FLANN. I WROTE UP BOTH OMEGA UNITS FOR MAINT INSPECTION AS HAVING BEEN RPTED 63 MI OFF-COURSE BY ATC.

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.