Cpr X non adherence to ATC clearance was proceeding direct wrong VOR with same frequency.

Attributes
ACN	300761
Time
Date	199503
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dny
State Reference	NY
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 170 flight time total : 10000
ASRS Report	300761
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was cleared direct dny (frequency 112.1) by ZOB. At FL330 all our navigation information told us to make a right turn to 150 degrees to proceed direct, however dny was a 085 degree heading. We had all stable indications and idents on the frequency of 112.1 MHZ before proceeding direct. After turning the aircraft, our long range navigation receiver failed and suddenly the VOR navigation equipment told us that dny was approximately a 090 degree crs. We immediately corrected back to the left to proceed direct dny after realizing what happened. At that time ZOB caught the deviation and advised us to correct back to the left and proceed direct dny. I reported the incident to ZOB on the ground at hpn as per the request by ZOB. I suspect co- channel interference with mrb (112.1 MHZ) as the cause. At the time this took place our approximately position was 130-140 mi west of dny and 140-150 mi northwest of mrb.

Original NASA ASRS Text

Title: CPR X NON ADHERENCE TO ATC CLRNC WAS PROCEEDING DIRECT WRONG VOR WITH SAME FREQ.

Narrative: I WAS CLRED DIRECT DNY (FREQ 112.1) BY ZOB. AT FL330 ALL OUR NAV INFO TOLD US TO MAKE A R TURN TO 150 DEGS TO PROCEED DIRECT, HOWEVER DNY WAS A 085 DEG HDG. WE HAD ALL STABLE INDICATIONS AND IDENTS ON THE FREQ OF 112.1 MHZ BEFORE PROCEEDING DIRECT. AFTER TURNING THE ACFT, OUR LONG RANGE NAV RECEIVER FAILED AND SUDDENLY THE VOR NAV EQUIP TOLD US THAT DNY WAS APPROX A 090 DEG CRS. WE IMMEDIATELY CORRECTED BACK TO THE L TO PROCEED DIRECT DNY AFTER REALIZING WHAT HAPPENED. AT THAT TIME ZOB CAUGHT THE DEV AND ADVISED US TO CORRECT BACK TO THE L AND PROCEED DIRECT DNY. I RPTED THE INCIDENT TO ZOB ON THE GND AT HPN AS PER THE REQUEST BY ZOB. I SUSPECT CO- CHANNEL INTERFERENCE WITH MRB (112.1 MHZ) AS THE CAUSE. AT THE TIME THIS TOOK PLACE OUR APPROX POS WAS 130-140 MI W OF DNY AND 140-150 MI NW OF MRB.

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.