1.1.P.170 PPL day Definition For the purposes of PLP, a 'PPL day' is a day in an instalment period that falls within the person's PPL period. PPL day is distinct from flexible PPL day (1.1.F.70). Act reference: PPLAct section 6 The Dictionary, section 63 Instalments of PLP Policy reference: PPL Guide 4.3.1 Instalments of PLP