▁L anka ▁in ▁the ▁Sri ▁L anka ▁Air ▁Force ▁Museum ▁at ▁Rat mal ana , ▁and ▁a ▁further ▁example ▁at ▁the ▁R MA F ▁Museum , ▁K ual a ▁L ump ur . ▁ ▁Vari ants ▁ ▁P ione er ▁( s ometimes ▁P ione er ▁ 1 ) ▁: ▁Four - se at ▁S TO L ▁transport ▁aircraft , ▁power ed ▁by ▁a ▁ 2 4 0 - hp ▁( 1 7 9 - k W ) ▁de ▁Hav ill and ▁Gi ps y ▁Queen ▁ 3 2 ▁p ist on ▁engine . ▁ ▁P ione er ▁ 2 ▁: ▁Five - se at ▁S TO L ▁transport ▁aircraft , ▁power ed ▁by ▁a ▁ 5 2 0 - hp ▁( 3 8 8 - k W ) ▁Al vis ▁Leon ides ▁radial ▁p ist on ▁engine . ▁ ▁P ione er ▁CC ▁M k ▁ 1 ▁: ▁Military ▁version ▁of ▁P ione er ▁ 2 , ▁five - se at ▁S TO L ▁cas ual ty ▁ev acu ation , ▁communic ations ▁aircraft ▁for ▁the ▁R AF . ▁ ▁Oper ators ▁▁ ▁( C ey lon ) ▁Royal ▁C ey lon ▁Air ▁Force ▁- ▁( 4 ▁aircraft , ▁including ▁one ▁originally ▁ordered ▁for ▁the ▁R AF ▁but ▁di vert ed ▁whilst ▁under ▁construction ▁to ▁ful fil ▁the ▁Royal ▁C ey lon ▁Air ▁Force ▁order ) ▁ ▁Royal ▁Mal ay an ▁Air ▁Force ▁- ▁( 9 ▁aircraft ) ▁ ▁Sultan ▁of ▁O man ' s ▁Air ▁Force ▁- ▁ 4 ▁aircraft ▁ex