 The replacement of the Fleet Air Arm 's Sea King fleet commenced faster than initially planned following the loss of a Sea King during a humanitarian aid mission in Indonesia in April 2005 , resulting in nine deaths . Investigators uncovered serious faults in the condition of the Sea King 's mechanical flight control system , resulting from maintenance deficiencies . In May 2007 , the six remaining Sea Kings were grounded for two months following the discovery of a number of missing parts . 
