A mathematical error is being blamed for an incident which saw a Boeing 737 with up to 200 passengers onboard narrowly avoid disaster as it ran out of runway during take-off in Moscow.
Russian authorities told local media pilots had entered an incorrect take-off weight - up to 15 tonnes below the aircraft's actual weight - when calculating their take-off speed and distance required.
Data from FlightRadar24.com also suggests the pilots began their take-off run around 1000m down the 2500m runway, rather than using its full length.
Surveillance video has been leaked online, revealing what happened when the S7 Airlines flight was taking off from Moscow's Domodedovo Airport on its way to Simferopol on the Crimean Peninsula on August 5.
Following the take-off, a runway inspection was carried out and smashed glass and broken lights were found at the end of the runway.
The aircraft was inspected upon landing in Simferopol, where staff located damage to the undercarriage of the aircraft including glass shards wedged into its tyres.
The airport released a statement advising there was no disruption to services at the airport.
"As a result of the occasion, no elements of illuminating devices were found on a runway as it spread outside of the movement area. The airport continued to function normally. The situation didn't affect take-offs and landings at the airport," the statement from Moscow Domodedovo Airport said.
No one was injured and Russian aviation authorities are investigating.