A Boeing 787-8 operated by Air India landed at Birmingham Airport in the United Kingdom with its Ram Air Turbine (RAT) unexpectedly deployed, according to reports from this past weekend. The incident occurred on Flight AI117, which departed Sri Guru Ram Dass Jee International Airport and arrived in Birmingham just after 19:00 on October 4. The deployment of the RAT was not known to the flight crew during the flight.
The RAT is a device intended to provide emergency power to critical systems if primary power sources fail. It is not designed to deploy unless there is a loss of hydraulic or electrical power, and such an event should be clearly indicated to pilots via cockpit displays.
Following this occurrence, Air India pilots and other commercial flight crews across India have called for all Boeing 787 Dreamliners to undergo electrical inspections before further flights. Pilot unions are demanding that the entire fleet be grounded until each aircraft is confirmed safe.