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E175 some ILS frequencies not functioning properly


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After properly programming the FMC for an ILS approach, some airports/frequencies fail to display Glide Slope information. With FMC selected, Prev button depressed and the correct FD course adjusted there is no MCDU indication of ILS capture. For example, KMHT ( Manchester, New Hampshire) has an ILS 6 frequency of 109.950. While on approach, the Outer Marker signal is received and glide slope indication is active, there is no lateral guidance and the MCDU does not indicate capture. Audible warnings of glide slope deviations are heard. All settings and programming have been double checked. Some airports, such as KPHL (Philadelphia) ILS 27L work fine. As an additional check, I flew the approach in a PA-161 with no difficulty. 


Is it possible for a user to try the approach and verify my findings? The forum lacks any posts regarding this matter.


I appreciate any input,



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