Navigation error. A B727-200 using omega navigation experiences a heading track position deviation. Non adherence to ATC clearance.

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Attributes
ACN	353659
Time
Date	199611
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : geg
State Reference	WA
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zse
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 20000 flight time type : 2500
ASRS Report	353659
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance non adherence : published procedure other anomaly other 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	Navigational Facility
Air Traffic Incident	Pilot Deviation other

Narrative:

B727 flight cvg-sea FL350. Aircraft using omega navigation on direct routing to glasr intersection on glasr 3 STAR and approximately 30 mi east of geg VOR. ATC called and asked if we were proceeding to glasr. I responded that we surely thought we were. ATC informed me that we were 18 mi north of the projected direct routing, at which point we corrected back on course, we disconnected the omega and continued on to glasr using VOR only navigation. Up to this point in the flight the omega had been working well. We had taken several fixes using VOR and DME information and all fixes were good. Landed in sea and advised maintenance to check out omega system.

Original NASA ASRS Text

Title: NAV ERROR. A B727-200 USING OMEGA NAV EXPERIENCES A HDG TRACK POS DEV. NON ADHERENCE TO ATC CLRNC.

Narrative: B727 FLT CVG-SEA FL350. ACFT USING OMEGA NAV ON DIRECT ROUTING TO GLASR INTXN ON GLASR 3 STAR AND APPROX 30 MI E OF GEG VOR. ATC CALLED AND ASKED IF WE WERE PROCEEDING TO GLASR. I RESPONDED THAT WE SURELY THOUGHT WE WERE. ATC INFORMED ME THAT WE WERE 18 MI N OF THE PROJECTED DIRECT ROUTING, AT WHICH POINT WE CORRECTED BACK ON COURSE, WE DISCONNECTED THE OMEGA AND CONTINUED ON TO GLASR USING VOR ONLY NAV. UP TO THIS POINT IN THE FLT THE OMEGA HAD BEEN WORKING WELL. WE HAD TAKEN SEVERAL FIXES USING VOR AND DME INFO AND ALL FIXES WERE GOOD. LANDED IN SEA AND ADVISED MAINT TO CHK OUT OMEGA SYS.

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.