Narrative:

On the ground in geg we were unable to complete init of FMC due to position init page not showing box for ZFW, as well as gw and fuel boxes being blank. Also, captain's localizer and VOR flags displays on ADI/HSI. Maintenance reracked radios and depwred/repwred aircraft and all system returned to normal. On climb out from geg, noticed localizer again displayed on ADI and shortly thereafter, VOR displayed on HSI. Checked FMC and previous errors were back on P os init page. Called dispatch, told them what we had, and they brought maintenance control into patch. Had us reset VOR/ILS circuit breaker, but no help. Although maintenance control was pushing us to go to den, I decided that a return to geg was the most prudent/safest course of action as we were now down to #1 VOR (the first officer's) as my VOR and the FMC were both inoperative. The dispatcher agreed, and we amended the release, and turned back to geg. By this time, we were approximately 125 mi out from geg. Then on descent into geg, while talking to geg approach, we lost the #2 VOR also. I did not declare an emergency as we were VFR with field in sight by this time, and under ATC radar vectors for visual approach (good VFR WX in geg). Landed without incident, with #2 ILS working fine, but #1 inoperative.

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Original NASA ASRS Text

Title: B737 FLT HAS A MALFUNCTION WITH THE FMC AND ELECTRONIC FLT INFO SYS, AND AFTER DISCUSSION WITH COMPANY, ELECTS TO RETURN TO THE DEP ARPT OF GEG.

Narrative: ON THE GND IN GEG WE WERE UNABLE TO COMPLETE INIT OF FMC DUE TO POS INIT PAGE NOT SHOWING BOX FOR ZFW, AS WELL AS GW AND FUEL BOXES BEING BLANK. ALSO, CAPT'S LOC AND VOR FLAGS DISPLAYS ON ADI/HSI. MAINT RERACKED RADIOS AND DEPWRED/REPWRED ACFT AND ALL SYS RETURNED TO NORMAL. ON CLBOUT FROM GEG, NOTICED LOC AGAIN DISPLAYED ON ADI AND SHORTLY THEREAFTER, VOR DISPLAYED ON HSI. CHKED FMC AND PREVIOUS ERRORS WERE BACK ON P OS INIT PAGE. CALLED DISPATCH, TOLD THEM WHAT WE HAD, AND THEY BROUGHT MAINT CTL INTO PATCH. HAD US RESET VOR/ILS CIRCUIT BREAKER, BUT NO HELP. ALTHOUGH MAINT CTL WAS PUSHING US TO GO TO DEN, I DECIDED THAT A RETURN TO GEG WAS THE MOST PRUDENT/SAFEST COURSE OF ACTION AS WE WERE NOW DOWN TO #1 VOR (THE FO'S) AS MY VOR AND THE FMC WERE BOTH INOP. THE DISPATCHER AGREED, AND WE AMENDED THE RELEASE, AND TURNED BACK TO GEG. BY THIS TIME, WE WERE APPROX 125 MI OUT FROM GEG. THEN ON DSCNT INTO GEG, WHILE TALKING TO GEG APCH, WE LOST THE #2 VOR ALSO. I DID NOT DECLARE AN EMER AS WE WERE VFR WITH FIELD IN SIGHT BY THIS TIME, AND UNDER ATC RADAR VECTORS FOR VISUAL APCH (GOOD VFR WX IN GEG). LANDED WITHOUT INCIDENT, WITH #2 ILS WORKING FINE, BUT #1 INOP.

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.