. NOTE' 1. Long range oxygen supply, Two (2) 114-9 cubic feet each, installed in this aircraft. Passenger and Long Range oxygen system approved by STC #SA951SW and FAA form *5110-3 dated Feb. 19, 1975 by DER SW-167, Walter T. Clark, Jr. reference 337 form dated Feb. 19, 1975. 2.- Flight Manual Supplement