hi
yesterday, I've flown a 734 from SFO to LAS.
During final approach (ILS), about 400-500 ft above the ground, my plane suddenly lost its glideslope which I looked on the HSI. Luckily I got it back in control, but the touchdown was hard i think. Man, almost crash.
Autopilot and auto throttle were still on. The glideslope and localizer indicator seem OK as I started the ILS approach at about 20nm away from the airport. Aircraft weight was below maximum landing weight. Weather was fine, no thunderstorm or raining.
Was it wind shear?











