Several members of the crew must be able to calculate the duration
of the oxygen supply. The following simple procedure will permit a
fairly accurate estimate of each systems duration. The figures are based
on altitudes between 20,000 and 30,000 feet where the majority of your
combat flying will take place.
G-1 CYLINDERS -- full charge 450 pounds -- each cylinder equals 5 man
hours.
FORMULA: 5 (man hours) x number of intact cylinders x actual
pressure/400 divided by number of men using oxygen from
system = DURATION in hours.
Examples:
FRONT LEFT SYSTEM - 5 cylinders -- full charge to 450 pounds = 25
man hours.
3 intact cylinders (2 shot out), pressure 200 pounds, pilot and
navigator on system.