Narrative:

We were en route from iws airport to iah airport when we lost the FMS. The captain who was flying told me to fly from the right side because my altimeter was working. We were given a heading to join the runway 26 localizer and cleared for the ILS 26 approach at iah. The captain accidentally put the 27 localizer frequency on my side and I joined the runway 27 localizer instead of the runway 26 localizer. The aircraft that was on the 27 approach was told to go around. Our first mistake was not notifying atl that we had a problem with our FMS. However, we didn't feel we had a serious problem because we had only lost the left hand altimeter and the flight director. I feel the confusion with the localizer frequency was caused by the distraction caused by the loss of the air data system.

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Original NASA ASRS Text

Title: LTT CPR JET FLEW THE WRONG LOC AT IAH, CAUSING ANOTHER ACFT TO BE GIVEN A MISSED APCH.

Narrative: WE WERE ENRTE FROM IWS ARPT TO IAH ARPT WHEN WE LOST THE FMS. THE CAPT WHO WAS FLYING TOLD ME TO FLY FROM THE R SIDE BECAUSE MY ALTIMETER WAS WORKING. WE WERE GIVEN A HDG TO JOIN THE RWY 26 LOC AND CLRED FOR THE ILS 26 APCH AT IAH. THE CAPT ACCIDENTALLY PUT THE 27 LOC FREQ ON MY SIDE AND I JOINED THE RWY 27 LOC INSTEAD OF THE RWY 26 LOC. THE ACFT THAT WAS ON THE 27 APCH WAS TOLD TO GAR. OUR FIRST MISTAKE WAS NOT NOTIFYING ATL THAT WE HAD A PROB WITH OUR FMS. HOWEVER, WE DIDN'T FEEL WE HAD A SERIOUS PROB BECAUSE WE HAD ONLY LOST THE L HAND ALTIMETER AND THE FLT DIRECTOR. I FEEL THE CONFUSION WITH THE LOC FREQ WAS CAUSED BY THE DISTR CAUSED BY THE LOSS OF THE AIR DATA SYS.

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.