|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||airport : geg.airport|
|Controlling Facilities||artcc : zse.artcc|
tracon : geg.tracon
tower : geg.tower
|Operator||common carrier : air carrier|
|Make Model Name||B737-300|
|Operating Under FAR Part||Part 121|
|Flight Phase||climbout : intermediate altitude|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 150|
flight time total : 15000
flight time type : 4500
|Affiliation||company : air carrier|
|Function||flight crew : first officer|
|Anomaly||aircraft equipment problem : less severe|
|Independent Detector||aircraft equipment other aircraft equipment : fmc fail light|
other flight crewa
other flight crewb
|Resolutory Action||flight crew : diverted to another airport|
Flight Crew Human Performance
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.
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.