6630/6630A Ifilimu yePolyester / ilaphu lepolyester engalukiweyo ilaphu elithambileyo (DMD), ekwabizwa ngokuba yiB-class DMD ebhetyebhetye iphepha lokugquma elidibanisayo, yilaminathi enemigangatho emithathu ebhetyebhetye apho icala ngalinye lefilimu yepolyester (M) lidityaniswa umaleko omnye welaphu lepolyester elingalukwanga (D).Uxhathiso lobushushu ludidi B.