0000899243-97-002407 424B3 1 19971219 NASD OFFSHORE LOGISTICS INC 0000073887 4522 720679819 DE 0331 424B3 33 333-23355 97740953 224 RUE DE JEAN PO BOX 5C LAFAYETTE LA 70505 3182331221 224 RUE DE JEAN 70508 PO BOX 5C LAFAYETTE LA 70505 424B3 1 000089924397002407-001-seq1-424b3.txt PROSPECTUS SUPPLEMENT #6