Narrative:

While navigating northwest on J36 about 70-80 mi west of lake henry (lhy 110.8) center called us right (north) of course and gave a steer to dunkirk (dkk 116.2). Our CDI showed on course at 7000' and drifting left (south) after that which we corrected for. In listening to a follow on discussion with an air carrier Q and air carrier right. They had the same problem. The ATC controller reports it as a daily occurrence. The problem is that with even just a 4 NM drift to the north, one comes very close to traffic on J223 out of elmira. Everyone's airborne navaids show them on course but lhy's signal is unreliable after 50-60 mi or so. Suggest that this route be checked and an earlier changeover point (now none is designated, therefore changeover is half way) be established and/or adjust J36.

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Original NASA ASRS Text

Title: ACR LGT TRACK DEVIATION CAUSES ENCROACHMENT ON ADJACENT PARALLEL AIRWAY. ZNY ARTCC RADAR CTLR SAYS IT'S A DAILY OCCURRENCE.

Narrative: WHILE NAVIGATING NW ON J36 ABOUT 70-80 MI W OF LAKE HENRY (LHY 110.8) CENTER CALLED US RIGHT (N) OF COURSE AND GAVE A STEER TO DUNKIRK (DKK 116.2). OUR CDI SHOWED ON COURSE AT 7000' AND DRIFTING LEFT (S) AFTER THAT WHICH WE CORRECTED FOR. IN LISTENING TO A FOLLOW ON DISCUSSION WITH AN ACR Q AND ACR R. THEY HAD THE SAME PROB. THE ATC CTLR RPTS IT AS A DAILY OCCURRENCE. THE PROB IS THAT WITH EVEN JUST A 4 NM DRIFT TO THE N, ONE COMES VERY CLOSE TO TFC ON J223 OUT OF ELMIRA. EVERYONE'S AIRBORNE NAVAIDS SHOW THEM ON COURSE BUT LHY'S SIGNAL IS UNRELIABLE AFTER 50-60 MI OR SO. SUGGEST THAT THIS ROUTE BE CHKED AND AN EARLIER CHANGEOVER POINT (NOW NONE IS DESIGNATED, THEREFORE CHANGEOVER IS HALF WAY) BE ESTABLISHED AND/OR ADJUST J36.

Data retrieved from NASA's ASRS site as of August 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.