Omega navigation deviation.

Attributes
ACN	284386
Time
Date	199409
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : osn airport : sel
State Reference	FO
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : rktt
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 11500 flight time type : 1700
ASRS Report	284386
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : overcame equipment problem other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

En route from sel to gum. Taegu center cleared us present position direct invoke intersection. We were navigating on omega. After 35 mins, taegu center told us we are 12 mi north of the course. We then realized both omegas were drifting. We shut down #1 omega, then re-energized it just like air carrier cockpit operating manual request us to do. We then resolved the problem, continued on our north pacific ocean crossing without any further problems. When we arrived at first outside navigation station, which was unz VOR at guam, we were right on course. We made a log entry.

Original NASA ASRS Text

Title: OMEGA NAV DEV.

Narrative: ENRTE FROM SEL TO GUM. TAEGU CTR CLRED US PRESENT POS DIRECT INVOKE INTXN. WE WERE NAVIGATING ON OMEGA. AFTER 35 MINS, TAEGU CTR TOLD US WE ARE 12 MI N OF THE COURSE. WE THEN REALIZED BOTH OMEGAS WERE DRIFTING. WE SHUT DOWN #1 OMEGA, THEN RE-ENERGIZED IT JUST LIKE ACR COCKPIT OPERATING MANUAL REQUEST US TO DO. WE THEN RESOLVED THE PROB, CONTINUED ON OUR N PACIFIC OCEAN XING WITHOUT ANY FURTHER PROBS. WHEN WE ARRIVED AT FIRST OUTSIDE NAV STATION, WHICH WAS UNZ VOR AT GUAM, WE WERE RIGHT ON COURSE. WE MADE A LOG ENTRY.

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.