Kathmandu, July 19 -- The pilots of a Bombardier CRJ-200 aircraft operated by Saurya Airlines that crashed at Tribhuvan International Airport in Kathmandu in July last year, killing 18 of the 19 people onboard, used incorrect takeoff speeds-known as V-speeds-as they relied on a faulty speedcard, according to the final investigation report released Friday.

The relevant V-speeds for the flight were calculated based on the incorrect page for the 18,500 kg takeoff weight in the speed card, even though the actual takeoff weight was 18,137 kg, as per the load and trim sheet, a document that details the weight and balance of an aircraft for flights.

The report noted that V-speeds for 18,137 kg should have been derived from the speed card page ...