0000899243-98-001105 424B3 1 19980601 NASD OFFSHORE LOGISTICS INC 0000073887 4522 720679819 DE 0331 424B3 33 333-23355 98640473 224 RUE DE JEAN PO BOX 5C LAFAYETTE LA 70505 3182331221 224 RUE DE JEAN 70508 PO BOX 5C LAFAYETTE LA 70505 424B3 1 000089924398001105-001-seq1-424b3.txt PROSPECTUS SUPPLEMENT #9