Narrative:

Shortly after departure from hnl, our #2 omega failed. The warning light was on and all of the information it displayed was obviously in error. The crew judged it to be totally inoperative and it was shut down. This required us to navigation on 1 omega backed up by dead reckoning. #1 omega had been functioning normally. After passing cortt reporting point, we entered a cloud layer and encountered moderate turbulence. This turbulence was right at sundown. 1 min our x-track error and track angle error was 0-0, and the next minute the #1 omega indicated 10 mi right and track angle error of 15 degrees. The warning light came on and a malfunction was indicated. Then, less than 5 mins after the warning light illuminated, it stopped and all indications showed us to be on course. We x-chked all information available, rechked coordinate entries and continued to backup the remaining #1 omega with dead reckoning. All checked ok and we concluded that the #1 omega had experienced a temporary malfunction due to either sunset, turbulence or some internal problem. When we contacted ZOA at clukk reporting point, they advised that their radar showed us to be 30 mi north of course. The #2 omega which failed first had required maintenance in hnl. Callback conversation with reporter revealed the following: reporter feels confident that he and the flight crew had done everything that was required of them re: the omega failure. Upon interviews with the company chief pilot he feels that the company has placed some burden on him for not having notified any agency of the failure of the #2 omega. Reporter stated that accepting for the mnps specifications on the pacific chart, there is no requirement for him to notify anyone re: the omega outage. Shortly thereafter, there was a company revision to the policy manual re: this issue. Maintenance was performed on the omegas in oak after the flight, but the reporter does not know what was done in the way of repairs. He has just received a letter from the FAA re: this incident.

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Original NASA ASRS Text

Title: ACR HVT EXPERIENCES A LOSS OF 1 OF THE 2 OMEGA SYSTEMS ON BOARD AND LATER HAS A WARNING LIGHT ON THE 1 REMAINING OMEGA FOR A SHORT TIME. AFTER FOLLOWING COMPANY NAVIGATION PROCS, HE IS ADVISED BY ZOA WHEN IN RADAR CONTACT THAT HE IS 30 MILES OFF COURSE. REPORTER DID NOT ADVISE ANY AGENCY OF ANY FAILURE.

Narrative: SHORTLY AFTER DEP FROM HNL, OUR #2 OMEGA FAILED. THE WARNING LIGHT WAS ON AND ALL OF THE INFO IT DISPLAYED WAS OBVIOUSLY IN ERROR. THE CREW JUDGED IT TO BE TOTALLY INOP AND IT WAS SHUT DOWN. THIS REQUIRED US TO NAV ON 1 OMEGA BACKED UP BY DEAD RECKONING. #1 OMEGA HAD BEEN FUNCTIONING NORMALLY. AFTER PASSING CORTT RPTING POINT, WE ENTERED A CLOUD LAYER AND ENCOUNTERED MODERATE TURB. THIS TURB WAS RIGHT AT SUNDOWN. 1 MIN OUR X-TRACK ERROR AND TRACK ANGLE ERROR WAS 0-0, AND THE NEXT MINUTE THE #1 OMEGA INDICATED 10 MI RIGHT AND TRACK ANGLE ERROR OF 15 DEGS. THE WARNING LIGHT CAME ON AND A MALFUNCTION WAS INDICATED. THEN, LESS THAN 5 MINS AFTER THE WARNING LIGHT ILLUMINATED, IT STOPPED AND ALL INDICATIONS SHOWED US TO BE ON COURSE. WE X-CHKED ALL INFO AVAILABLE, RECHKED COORDINATE ENTRIES AND CONTINUED TO BACKUP THE REMAINING #1 OMEGA WITH DEAD RECKONING. ALL CHKED OK AND WE CONCLUDED THAT THE #1 OMEGA HAD EXPERIENCED A TEMPORARY MALFUNCTION DUE TO EITHER SUNSET, TURB OR SOME INTERNAL PROB. WHEN WE CONTACTED ZOA AT CLUKK RPTING POINT, THEY ADVISED THAT THEIR RADAR SHOWED US TO BE 30 MI N OF COURSE. THE #2 OMEGA WHICH FAILED FIRST HAD REQUIRED MAINT IN HNL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR FEELS CONFIDENT THAT HE AND THE FLT CREW HAD DONE EVERYTHING THAT WAS REQUIRED OF THEM RE: THE OMEGA FAILURE. UPON INTERVIEWS WITH THE COMPANY CHIEF PLT HE FEELS THAT THE COMPANY HAS PLACED SOME BURDEN ON HIM FOR NOT HAVING NOTIFIED ANY AGENCY OF THE FAILURE OF THE #2 OMEGA. RPTR STATED THAT ACCEPTING FOR THE MNPS SPECS ON THE PACIFIC CHART, THERE IS NO REQUIREMENT FOR HIM TO NOTIFY ANYONE RE: THE OMEGA OUTAGE. SHORTLY THEREAFTER, THERE WAS A COMPANY REVISION TO THE POLICY MANUAL RE: THIS ISSUE. MAINT WAS PERFORMED ON THE OMEGAS IN OAK AFTER THE FLT, BUT THE RPTR DOES NOT KNOW WHAT WAS DONE IN THE WAY OF REPAIRS. HE HAS JUST RECEIVED A LETTER FROM THE FAA RE: THIS INCIDENT.

Data retrieved from NASA's ASRS site as of August 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.