Narrative:

Cleared for localizer back course runway 4L at btr. GS signals (presumably from ILS 22R) are received. On a visual day when maintaining a 3 degree GS this is no problem. However, when shooting this approach IMC, after stepping down to 720 ft at 'leiko' intersection and then to 580 ft at DME 2.0 iclz localizer, one goes below this erroneous GS (as indicated on GS receiver). The GPWS then gives an aural 'GS' warning from 'leiko' all the way down. This creates a very disturbing annoyance. This GS transmitter needs to be turned off when utilizing localizer back course to 4L. Callback conversation with reporter revealed the following information: the reporter is flying a dc-9, an older aircraft. This may be germane to the discussion. The GPWS 'GS' warning can be shut off, but during the step down procedure, it comes back on again and again. This is distracting to the crew and is audible in the cabin, creating questions of crew competency in the minds of the passenger. The reporter complained to the tower, asking them if the 22R GS could be turned off while the back course 4R is in use. The tower suggested filing a form with the ASRS. The reporter states that this situation is very distracting in IMC conditions.

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Original NASA ASRS Text

Title: AN ACR DC-9 FO RPTS THAT HE GETS GPWS 'GS' WARNINGS WHILE SHOOTING THE BACK COURSE 4R ILS TO BTR.

Narrative: CLRED FOR LOC BACK COURSE RWY 4L AT BTR. GS SIGNALS (PRESUMABLY FROM ILS 22R) ARE RECEIVED. ON A VISUAL DAY WHEN MAINTAINING A 3 DEG GS THIS IS NO PROB. HOWEVER, WHEN SHOOTING THIS APCH IMC, AFTER STEPPING DOWN TO 720 FT AT 'LEIKO' INTXN AND THEN TO 580 FT AT DME 2.0 ICLZ LOC, ONE GOES BELOW THIS ERRONEOUS GS (AS INDICATED ON GS RECEIVER). THE GPWS THEN GIVES AN AURAL 'GS' WARNING FROM 'LEIKO' ALL THE WAY DOWN. THIS CREATES A VERY DISTURBING ANNOYANCE. THIS GS XMITTER NEEDS TO BE TURNED OFF WHEN UTILIZING LOC BACK COURSE TO 4L. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR IS FLYING A DC-9, AN OLDER ACFT. THIS MAY BE GERMANE TO THE DISCUSSION. THE GPWS 'GS' WARNING CAN BE SHUT OFF, BUT DURING THE STEP DOWN PROC, IT COMES BACK ON AGAIN AND AGAIN. THIS IS DISTRACTING TO THE CREW AND IS AUDIBLE IN THE CABIN, CREATING QUESTIONS OF CREW COMPETENCY IN THE MINDS OF THE PAX. THE RPTR COMPLAINED TO THE TWR, ASKING THEM IF THE 22R GS COULD BE TURNED OFF WHILE THE BACK COURSE 4R IS IN USE. THE TWR SUGGESTED FILING A FORM WITH THE ASRS. THE RPTR STATES THAT THIS SIT IS VERY DISTRACTING IN IMC CONDITIONS.

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.