The European Aviation Safety Agency (EASA) recommends MD-11 operators to install a landing gear Struts Extended Annunciation System (SEAS) to prevent bounced landing accidents.
In the light of several bounced landing accidents involving MD-11 aircraft, Boeing developed a system which gives additional information about the aeroplane’s air/ground status to pilots during landing. The so called landing gear Struts Extended Annunciation System (SEAS) illuminates dedicated lights on the glare shield in front of both pilots when the main landing gear struts are close to, or are at full extension. In this way, pilots are more aware if a bounce has occurred, and control inputs can be made which will avoid the bounce developing into a more serious event.
EASA recommends operators to install the Landing Gear SEAS per Boeing SB MD11-32-093 (or its equivalent which matches the specific aeroplane cockpit) as mitigation for the risk of inappropriate control inputs after bounced landings. This should be combined with enhanced training using amended FCOM procedures and special maintenance tasks provided by the Boeing Company.
A system to show the landing/strut gear touchdown status was first recommended by the Japanese TSB in April 2013. This recommendation followed the investigation into a fatal MD-11F accident at Tokyo-Narita Airport, Japan, in March 2009. Both pilots died when the left wing fractured following a bounced landing. The airplane rolled over and a fire erupted.