▁the ▁event . ▁The ▁Red ▁Ar rows ▁were ▁given ▁their ▁air worth iness ▁back ▁by ▁early ▁December ▁ 2 0 1 1 . ▁( Wh ile ▁other ▁aircraft ▁have ▁the ▁M k . 1 0 - series ▁seat , ▁only ▁the ▁Haw k ▁retain s ▁the ▁Sc iss or / D rog ue ▁Sh ack le ▁par ach ute ▁release ▁mechanism , ▁the ▁R AF ▁having ▁refused ▁to ▁upgrade ▁the ▁seats ▁in ▁ 1 9 8 4 . ▁Therefore , ▁the ▁Haw k ▁seats ▁are ▁not ▁at ▁the ▁recommended ▁manufact urer ' s ▁build ▁standard ). ▁ ▁The ▁seat ▁did ▁not ▁act ▁in ▁the ▁sequence ▁that ▁it ▁was ▁supposed ▁to ; ▁after ▁e jection ▁from ▁the ▁can opy ▁and ▁a ▁ce iling ▁height ▁is ▁att ained , ▁the ▁seat ▁is ▁supposed ▁to ▁drop ▁away ▁and ▁a ▁main ▁par ach ute ▁deploy ▁to ▁allow ▁the ▁pilot ▁to ▁dr ift ▁back ▁down ▁to ▁the ▁ground . ▁A ▁b olt ▁had ▁been ▁over - t ight ened ▁which ▁meant ▁that ▁the ▁sequence ▁could ▁not ▁complete ▁properly . ▁It ▁was ▁noted ▁that ▁the ▁init iation ▁of ▁the ▁e jection ▁seat ▁was ▁almost ▁impossible ▁to ▁do ▁accident ally , ▁with ▁senior ▁officers ▁from ▁the ▁R AF ▁at ▁a ▁loss ▁to ▁explain ▁how ▁it ▁happened . ▁ ▁The ▁Service ▁In qu iry ▁into ▁the ▁accident ▁found ▁that ▁the ▁Se at ▁F iring ▁Handle ▁( SF H ) ▁safety ▁pin , ▁had ▁been ▁disp la ced ▁on ▁an ▁earlier ▁flight ▁( 4 ▁November ▁ 2 0 1 1 ) ▁and