0001258897-17-000959 SC 13G/A 1 20170209 20170209 PHI INC 0000350403 4522 720395707 LA 1231 SC 13G/A 34 005-33163 17584653 2001 SE EVANGELINE THRUWAY - LAFAYETTE LA 70508 (337) 235-2452 PO BOX 90808 LAFAYETTE LA 70509 PETROLEUM HELICOPTERS INC 19920703 DIMENSIONAL FUND ADVISORS LP 0000354204 0000 222370029 DE 1231 SC 13G/A 6300 BEE CAVE ROAD BUILDING ONE AUSTIN TX 78746 (512) 306-7400 6300 BEE CAVE ROAD BUILDING ONE AUSTIN TX 78746 DIMENSIONAL FUND ADVISORS INC 19920929 SC 13G/A 1 dfs161.htm SCHEDULE 13G/A