A British Airways crew member accidentally deployed the aircraft鈥檚 emergency slide, delaying hundreds of passengers for hours.
On Monday, a British Airways flight from London鈥檚 Heathrow Airport to Brussels was being prepared for service when the incident occurred.
No passengers were on board at the time, although they were delayed around three hours after the Airbus A320 was taken out of service and a new aircraft was arranged to take them to Brussels.
The blunder was first reported by the Sun, which said the incident was likely to have cost the airline 拢100,000 ($218,034).
A source told the Sun: 鈥淭he crew member wasn鈥檛 thinking and made the most basic of errors by deploying the emergency slide while on the ground at Heathrow.
鈥淚t鈥檚 a minimum 拢100,000 mistake and knocked out services for the rest of the day.
鈥淭his error is not easy to achieve.鈥
In a statement to the Sun, BA said: 鈥淲e apologised to customers for the delay and our teams worked hard to arrange a replacement aircraft so customers were able to travel with us as planned.鈥
Footage of the incident showed emergency services stationed by the aircraft which had the inflatable slide extending from the fuselage.
According to Airbus' safety magazine, Safety First, one way of deploying a slide on an A320 Family aircraft requires removing a safety pin, moving a lever into the armed position, and then opening the door to trigger deployment.
Accidental emergency door activations are very costly for airlines. Rectifying it involves repacking and safety checks by engineers.
An unintentionally activated emergency slide that is attached to an air bridge can cause the door to be ripped off and block exits, taking planes and docking bays out of service.
Last February, a British Airways pilot was reportedly stood down after accidentally triggering the emergency exit on a busy A320.
A 22-year-old was piloting a service that had arrived from the Czech Republic at Heathrow Airport for a quick turnaround to Bucharest, reported the Sun.
The error allegedly cost the airline 拢50,000 ($100,000) and a new rubber slide.
Take your Radio, Podcasts and Music with you
Get the iHeart App
Get more of the radio, music and podcasts you love with the FREE iHeartRadio app. Scan the QR code to download now.
Download from the app stores
Stream unlimited music, thousands of radio stations and podcasts all in one app. iHeartRadio is easy to use and all FREE