“During the approach, there were statements made in the cockpit, first about being over the glide path, then about being on the glide path, then about being under the glide path, Hersman explained, citing the CVR. One pilot has told investigators he realized the aircraft was too low at about 500 feet, or about 34 seconds to impact with SFO’s sea wall."
But even as the pilots were aware of being too high and then too low, they did not realize the 777’s speed had dropped from a target speed of 137 knots to 103 knots until seconds before impact, according to NTSB.
NTSB completes work at Asiana 777 crash site; no systems anomalies found | Safety content from ATWOnline