Asiana Airlines says a Boeing 777 that crashed at San Francisco International Airport had inadequate warning systems to alert the crew to problems with air speed.
In a filing with the National Transportation Safety Board released on Monday, the airline says there was no indication that the plane's autothrottle had stopped maintaining the set air speed.
Additionally, it says a low air speed alerting system came on too late for the pilots to avoid the crash.
Asiana also acknowledged that its crew failed to monitor and maintain a safe airspeed but said inconsistencies in the aircraft's automation logic and deficient warning systems contributed to the failure.
The NTSB previously said the crew showed signs of confusion about the elaborate computer systems of the Boeing 777 that crashed on July 6 and resulted in three deaths.