Air carrier medium large transport using VLF omega RNAV experiences a track deviation.

Attributes
ACN	136240
Time
Date	199002
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : tlh
State Reference	FL
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
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 airway : j43
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 5400 flight time type : 380
ASRS Report	136240
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were flying south on J43 toward st petersburg, fl. The controller gave us a left turn 15 degrees to avoid a warning area. We were using omega navigation at the time. We turned back on course with the VOR. The omega turned out to be 18 degrees off course.

Original NASA ASRS Text

Title: ACR MLG USING VLF OMEGA RNAV EXPERIENCES A TRACK DEVIATION.

Narrative: WE WERE FLYING S ON J43 TOWARD ST PETERSBURG, FL. THE CTLR GAVE US A LEFT TURN 15 DEGS TO AVOID A WARNING AREA. WE WERE USING OMEGA NAVIGATION AT THE TIME. WE TURNED BACK ON COURSE WITH THE VOR. THE OMEGA TURNED OUT TO BE 18 DEGS OFF COURSE.

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.