316
14 CFR Ch. I (1–1–14 Edition)
§ 23.1443
§ 23.1443
Minimum mass flow of sup-
plemental oxygen.
(a) If the airplane is to be certified
above 41,000 feet, a continuous flow ox-
ygen system must be provided for each
passenger.
(b) If continuous flow oxygen equip-
ment is installed, an applicant must
show compliance with the require-
ments of either paragraphs (b)(1) and
(b)(2) or paragraph (b)(3) of this sec-
tion:
(1) For each passenger, the minimum
mass flow of supplemental oxygen re-
quired at various cabin pressure alti-
tudes may not be less than the flow re-
quired to maintain, during inspiration
and while using the oxygen equipment
(including masks) provided, the fol-
lowing mean tracheal oxygen partial
pressures:
(i) At cabin pressure altitudes above
10,000 feet up to and including 18,500
feet, a mean tracheal oxygen partial
pressure of 100mm Hg when breathing
15 liters per minute, Body Tempera-
ture, Pressure, Saturated (BTPS) and
with a tidal volume of 700cc with a con-
stant time interval between respira-
tions.
(ii) At cabin pressure altitudes above
18,500 feet up to and including 40,000
feet, a mean tracheal oxygen partial
pressure of 83.8mm Hg when breathing
30 liters per minute, BTPS, and with a
tidal volume of 1,100cc with a constant
time interval between respirations.
(2) For each flight crewmember, the
minimum mass flow may not be less
than the flow required to maintain,
during inspiration, a mean tracheal ox-
ygen partial pressure of 149mm Hg
when breathing 15 liters per minute,
BTPS, and with a maximum tidal vol-
ume of 700cc with a constant time in-
terval between respirations.
(3) The minimum mass flow of sup-
plemental oxygen supplied for each
user must be at a rate not less than
that shown in the following figure for
each altitude up to and including the
maximum operating altitude of the air-
plane.
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