(1)
Demand oxygen equipment if the airplane is to be certi.cated for operation above 25,000 feet.

(2)
Pressure demand oxygen equipment if the airplane is to be certi.cated for operation above 40,000 feet.

(e)
There must be a means, readily available to the crew in .ight, to turn on and to shut o. the oxygen supply at the high pressure source. This shuto. requirement does not apply to chemical oxygengenerators.]

Amdt. 23-43, E.. 05/10/93
FAR 23.1443 : Minimum mass .ow of supplemental oxygen.
(a)
[Ifcontinuous .owoxygenequipmentisinstalled,anapplicant must showcompliance with the requirements of eitherparagraphs(a)(1) and(a)(2) orparagraph(a)(3) of this section :

(1)
For each passenger, the minimum mass .ow of supplemental oxygen required at various cabin pressure altitudes may not be less than the .ow required to maintain,duringinspiration and while using the oxygen equipment(including masks) provided,thefollowing meantracheal oxygenpartialpressures:

(i)
At cabin pressure altitudes above 10,000 feet up to and including 18,500 feet, a meantrachealoxygenpartialpressure of100mmHg whenbreathing 15litersper minute,BodyTemperature,Pressure,Saturated(BTPS) and with a tidal volume of 700cc with a constant time interval between respi-rations.

(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 brea-thing30litersper minute, BTPS, and with a tidal volume of1,100cc with a constant time interval between respirations.

(2)
For each .ight crewmember, the minimum mass .ow may not be less than the .ow required to maintain, during inspiration, a mean tracheal oxygen partial pressure of 149mm Hg when breathing 15 liters per minute, BTPS, and with a maximum tidal volume of 700cc with a constant time interval between respirations.

(3)
The minimum mass .ow of supplemental oxygen supplied for each user must be at a rate not less than that shown in the following .gure for each altitude up to and including the maximum operating altitude of the airplane.

(b)
If demand equipment is installed for use by .ight crewmembers, the minimum mass .ow of supplemental oxygen required for each .ight crewmember may not be less than the .ow required to maintain, during inspiration, a mean tracheal oxygen partial pressure of 122mm Hg up to and including a cabin pressure altitude of 35,000feet, and95percent oxygenbetween cabinpressure altitudes of35,000 and 40,000 feet, when breathing 20 liters per minutes BTPS. In addition, there must be means to allow the crew to use undiluted oxygen at their discretion.

(c)
If .rst-aid oxygen equipment is installed, the minimum mass .ow of oxygen to each user may not be less than 4 liters per minute, STPD. However, there may be a means to decrease this .ow to not less than 2 liters per minute, STPD, at any cabin altitude.Thequantity of oxygenrequiredisbased upon an average .ow rate of 3 liters per minute per person for whom .rst-aid oxygen is required.

1020 30
40
Cabin Pressure Altitude. Thousands of Feet
Fig. 33.1 – FAR 23.1443 : Oxygen Mass Flow/Cabin Pressure Altitude.
(d) As used in this section :
(1)
BTPSmeansBodyTemperature, andPressure, saturated(whichis,37'C, and the ambient pressure to which the body is exposed, minus 47mm Hg, which isthetrachealpressuredisplacedby water vaporpressure whenthebreathed air becomes saturated with water vapor at 37'C).

(2)
STPD means Standard, Temperature, and Pressure, Dry (which is, 0'C at 760mmHg with no water vapor).]

Amdt. 23-43, E.. 05/10/93
FAR23.1445 :[Oxygendistribution system.]
(a)
[Exceptfor .exiblelinesfromoxygenoutletstothedispensingunits,orwhereshown to be otherwise suitable to the installation, nonmetallic tubing must not be used forany oxygenlinethatisnormallypressurizedduring .ight.
　
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