Many have been modified by replacing the original Pratt & Whitney Wasp H radial engines with modern turboprop engines.
ຫລາຍໆຄົນໄດ້ຖືກປັບປຸງໂດຍການປ່ຽນເຄື່ອງຈັກທີ່ເປັນ Radial Pratt & Whitney Wasp H ເດີມດ້ວຍເຄື່ອງຈັກ turboprop ທີ່ທັນສະ ໄຫມ.