▁counter me asures ▁version ▁of ▁the ▁R 4 Y - 2 , ▁five ▁cancel led ▁R 4 Y - 2 S ▁Project ed ▁United ▁States ▁Navy ▁Anti - Sub marine ▁War fare ▁tra iner ▁version , ▁ 1 4 ▁on ▁order ▁cancel led . ▁X T - 2 9 ▁Pro totype ▁military ▁tra iner ▁version ▁of ▁the ▁Model ▁ 2 4 0 ▁for ▁the ▁United ▁States ▁Air ▁Force , ▁two ▁built . ▁T - 2 9 A ▁Initial ▁production ▁version ▁for ▁navig ator ▁training , ▁un press ur ised ▁cabin ▁for ▁ 1 4 ▁students , ▁ 4 6 ▁built . ▁V T - 2 9 A ▁T - 2 9 As ▁converted ▁for ▁staff ▁transport . ▁T - 2 9 B ▁Press ur ised ▁version ▁with ▁room ▁for ▁ 1 0 ▁navig ator ▁and ▁four ▁radio ▁operator ▁students , ▁ 1 0 5 ▁built . ▁N T - 2 9 B ▁One ▁T - 2 9 B ▁used ▁for ▁permanent ▁testing . ▁V T - 2 9 B ▁T - 2 9 B ▁converted ▁for ▁staff ▁transport ▁with ▁se ating ▁for ▁ 2 9 ▁or ▁ 3 2 ▁passengers . ▁T - 2 9 C ▁T - 2 9 B ▁with ▁ 2 5 0 0 hp ▁Pr att ▁& ▁Whit ney ▁R - 2 8 0 0 - 2 9 W ▁engines , ▁ 1 1 9 ▁built . ▁AT - 2 9 C ▁T - 2 9 C ▁modified ▁for ▁air ways ▁checking ▁duties , ▁red es ign ated ▁E