Aircraft equipment problem. Omega navigation system (ONS).

Attributes
ACN	308067
Time
Date	199506
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zjx
State Reference	FL
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx tower : pit
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	308067
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Navigation failure. En route along AR7, needed to deviate around WX. ATC approved we were then cleared direct to ilm, but cleared to deviate as needed around WX. We were out of VOR range, but following omega navigation system we ended up southeast of smelt intersection. ATC then vectored us back to ilm. The omega navigation system was taking us far off course. The omega navigation system departure accuracy checks were ok, and 1 more additional check was performed ok. After the failure, the omega navigation system showed an amber light and did not work properly for remainder of flight. Omega navigation system was written up in lga.

Original NASA ASRS Text

Title: ACFT EQUIP PROB. OMEGA NAV SYS (ONS).

Narrative: NAV FAILURE. ENRTE ALONG AR7, NEEDED TO DEVIATE AROUND WX. ATC APPROVED WE WERE THEN CLRED DIRECT TO ILM, BUT CLRED TO DEVIATE AS NEEDED AROUND WX. WE WERE OUT OF VOR RANGE, BUT FOLLOWING OMEGA NAV SYS WE ENDED UP SE OF SMELT INTXN. ATC THEN VECTORED US BACK TO ILM. THE OMEGA NAV SYS WAS TAKING US FAR OFF COURSE. THE OMEGA NAV SYS DEP ACCURACY CHKS WERE OK, AND 1 MORE ADDITIONAL CHK WAS PERFORMED OK. AFTER THE FAILURE, THE OMEGA NAV SYS SHOWED AN AMBER LIGHT AND DID NOT WORK PROPERLY FOR REMAINDER OF FLT. OMEGA NAV SYS WAS WRITTEN UP IN LGA.

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.