Tinjauan yuridis permohonan pernyataan pailit oleh debitor (voluntary petition): studi kasus putusan nomor 48/Pdt.Sus.pailit/2014/PN.Niaga.Jkt.Pst dalam perkara kepailitan PT. Mandala Airlines = Juridical perspective of bankruptcy petition by debtor (voluntary petition): case study decision no48/Pdt.Sus.pailit/2014/PN.Niaga.Jkt.Pst in bankruptcy case of PT. Mandala Airlines