On September 9, 2023, a Delta Air Lines Boeing 767-300, operating flight DL155 from Boston to Dublin, landed safely at Dublin Airport around 7:20 AM local time. However, after the aircraft arrived at the gate, an emergency evacuation slide was inadvertently deployed. This incident led to a flight delay and incurred significant costs for the airline.

The Cost of the Mistake

The accidental deployment of the emergency slide is estimated to have cost Delta Air Lines approximately $35,000. This figure accounts for the replacement of the slide, maintenance, and associated delays. For wide-body aircraft like the Boeing 767, these costs can be even higher.

MORE ARTICLES:

How Did It Happen?

The Boeing 767's doors open upwards into the aircraft's interior. The slide arming mechanism is located very close to the door opening handle, which also moves upward. This design can make it challenging to disarm the slide properly. In this case, a flight attendant inadvertently moved the door handle, triggering the slide deployment.

Industry Context

Inadvertent slide deployments (ISDs) are not uncommon in the aviation industry. According to aircraft manufacturer Airbus, there are approximately three ISDs worldwide every day, with four out of five occurring during aircraft arrival. Flight attendants are responsible for about 65% of these incidents, often due to factors like fatigue or lack of concentration.

Safety Protocols

To prevent such incidents, flight attendants are trained to follow strict safety protocols, including:

  • Disarming the slide mechanism before opening the door.

  • Cross-checking with the other flight attendant to ensure the door is properly disarmed.

  • Conducting an "all call" to confirm that all safety procedures are followed.

Despite these measures, human error can occur, leading to unintended slide deployments.

Aftermath and Response

Following the incident, Delta Air Lines took immediate action to replace the deployed slide and ensure the aircraft was ready for its next flight. While the airline did not disclose the specific actions taken regarding the flight attendant involved, such incidents are typically addressed through internal reviews and additional training.