Narrative:

ILS normal until 700 ft above ground. Received computer flags on both flight directors. Raw data localizer and GS were normal. Continued approach until about 300 ft AGL executed missed approach because aircraft was too far off course to the right. Localizer and GS indicated on course and on GS. No flags, localizer or GS were visible on either flight director and raw data indications indicated aircraft on course and GS. I spoke with msp tower after we landed on runway 11L on another approach, and they indicated they received no warnings that runway 11R ILS was giving erroneous information during our approach. Synopsis: ILS runway 11R was sending out erroneous information without triggering warning system in tower or off flags in aircraft. Supplemental information from acn 353370: arriving at msp, ATIS reported runway 11R ILS OTS. After being released from holding, ATIS reported 800/1, the runway 11R ILS was not reported OTS. At approximately 400 ft AGL we broke out and in low visibility saw the runway 3 wing lengths to the left. At minimums, a missed approach was initiated but not before 'whoop, whoop, terrain.' the GPWS aural warning was unheard by the captain and first officer due to their increased workload during the go around and the tremendous noise of the wipers.

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Original NASA ASRS Text

Title: B727-200 ON ILS TO RWY 11R AT 700 FT ABOVE GND GOT COMPUTER FLAGS ON BOTH FLT DIRECTORS. CONTINUED APCH USING RAW DATA. WHEN CLR OF CLOUDS AT 300 FT, EXECUTED MISSED APCH ACCOUNT OFFSET TO R OF CTRLINE. INDICATIONS HAD BEEN ON COURSE AND ON GS. MADE SUCCESSFUL APCH RWY 11L. ATIS EARLIER HAD SHOWN ILS RWY 11R OTS.

Narrative: ILS NORMAL UNTIL 700 FT ABOVE GND. RECEIVED COMPUTER FLAGS ON BOTH FLT DIRECTORS. RAW DATA LOC AND GS WERE NORMAL. CONTINUED APCH UNTIL ABOUT 300 FT AGL EXECUTED MISSED APCH BECAUSE ACFT WAS TOO FAR OFF COURSE TO THE R. LOC AND GS INDICATED ON COURSE AND ON GS. NO FLAGS, LOC OR GS WERE VISIBLE ON EITHER FLT DIRECTOR AND RAW DATA INDICATIONS INDICATED ACFT ON COURSE AND GS. I SPOKE WITH MSP TWR AFTER WE LANDED ON RWY 11L ON ANOTHER APCH, AND THEY INDICATED THEY RECEIVED NO WARNINGS THAT RWY 11R ILS WAS GIVING ERRONEOUS INFO DURING OUR APCH. SYNOPSIS: ILS RWY 11R WAS SENDING OUT ERRONEOUS INFO WITHOUT TRIGGERING WARNING SYS IN TWR OR OFF FLAGS IN ACFT. SUPPLEMENTAL INFO FROM ACN 353370: ARRIVING AT MSP, ATIS RPTED RWY 11R ILS OTS. AFTER BEING RELEASED FROM HOLDING, ATIS RPTED 800/1, THE RWY 11R ILS WAS NOT RPTED OTS. AT APPROX 400 FT AGL WE BROKE OUT AND IN LOW VISIBILITY SAW THE RWY 3 WING LENGTHS TO THE L. AT MINIMUMS, A MISSED APCH WAS INITIATED BUT NOT BEFORE 'WHOOP, WHOOP, TERRAIN.' THE GPWS AURAL WARNING WAS UNHEARD BY THE CAPT AND FO DUE TO THEIR INCREASED WORKLOAD DURING THE GAR AND THE TREMENDOUS NOISE OF THE WIPERS.

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.