Narrative:

On approach/landing phase into ZZZ arriving from the south and being vectored downwind the controller vectored us for the visual approach to xxr. The day was VMC and we backed up the visual with the ILS to xxr. We were vectored from above the glide path and captured from above. We were told to do 180 knots or greater to the FAF. The FMA's (flight mode annunciator) during final commanded a 10 degrees nose down pitch attitude inside the final approach fix even though we were below the glide path. I was the flying pilot and first attempted to understand the information; and realizing the flight director was commanding a descent away from the glide path; indicating a false capture. [I] turned off the flight director and flew a visual approach with no flight director guidance since the flight director guidance was not usable. Both fmas showed the [same] exact indications. We were approximately 3 - 4 miles from the runway when I immediately stopped the descent and flew raw data using the runway and VASI's for landing. The tower mentioned that we appeared low and we let them know that we were shallowing out our visual descent. The landing was uneventful. The crew agreed that we make a log book write up for a false G/south (glideslope) capture by the flight director. When I departed on a jump seat commuting home I heard an aircraft on xxr going around mentioning a false glide slope capture/unreliable glide slope. I made a note to mark down the time and even though we were on a visual felt the false/unreliable G/south flight direction guidance should be reported.

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Original NASA ASRS Text

Title: B787 flight crew reported receiving a low altitude alert from the Tower on a visual approach. Crew cited a false glideslope as contributing factor.

Narrative: On approach/landing phase into ZZZ arriving from the south and being vectored downwind the controller vectored us for the visual approach to XXR. The day was VMC and we backed up the visual with the ILS to XXR. We were vectored from above the glide path and captured from above. We were told to do 180 knots or greater to the FAF. The FMA's (Flight Mode Annunciator) during final commanded a 10 degrees nose down pitch attitude inside the final approach fix even though we were below the glide path. I was the flying pilot and first attempted to understand the information; and realizing the flight director was commanding a descent away from the glide path; indicating a false capture. [I] turned off the flight director and flew a visual approach with no Flight Director guidance since the Flight Director guidance was not usable. Both FMAs showed the [same] exact indications. We were approximately 3 - 4 miles from the runway when I immediately stopped the descent and flew raw data using the runway and VASI's for landing. The Tower mentioned that we appeared low and we let them know that we were shallowing out our visual descent. The landing was uneventful. The crew agreed that we make a log book write up for a false G/S (glideslope) capture by the Flight Director. When I departed on a jump seat commuting home I heard an aircraft on XXR going around mentioning a false glide slope capture/unreliable glide slope. I made a note to mark down the time and even though we were on a visual felt the false/unreliable G/S flight direction guidance should be reported.

Data retrieved from NASA's ASRS site 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.