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|  MIL-D-19326H
3.3.1.3 Transport aircraft supply. Transport aircraft shall have an oxygen
system of sufficient capacity to supply all of the primary crewmembers and all of
the passengers with breathing oxygen whenever the cabin altitude exceeds 10,000
feet (3,048 meters). In the event of loss of cabin pressure, the oxygen system
shall provide the full primary aircrew with breathing oxygen for at least 50
percent of the design mission duration. The passenger oxgen supply shall be
dispensed from a continuous flow system and shall have sufficient capacity to
provide breathing oxygen to a full passenger load for 50 percent of the design
mission duration or for a shorter period if so specified by the acquiring
activity, but in no case for less than 15 minutes. When therapeutic oxygen
capability is specified, a supplemental quantity shall be included within the
passenger oxygen supply. Therapeutic oxygen usage shall be independent from
passenger oxygen usage and the quantity shall be adequate for 100 percent of the
design mission plus two hours to allow for patient loading and unloading.
* 3.3.1.4 Mission specialist and training aircraft supply. Mission specialist
and training aircraft shall have an oxygen system of sufficient capacity to supply
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the entire flight crew, mission specialists, trainees, and any passengers (if)
applicable) with breathing oxygen whenever the cabin altitude exceeds
10,000 feet (3,048 meters). The flight crew and mission specialists may need
additional oxygen supply for extended flight at higher altitudes to continue the
mission, inflight refueling, and night flight. The oxgen system shall support
all aircraft occupants during repressurization at cabin altitudes and durations as
specified by the acquisition activity.
* 3.3.1.5 Systems utilizing demand and pressure demand breathing equipment.
Aircraft having flight ceilings over 10,000 feet 3.048 meters), but not over
approximately 35,000 feet (7,620 meters) of altitude and the capability of
descending immediately to 10,000 feet (3.048 meters) or below following a
decompression, shall use demand breathing equipment. USAF equipment shall
incorporate air dilution where possible. Aircraft having flight ceeilings over
35,000 feet (7,620 meters) of altitude and the capability of descending
immediately to 10,000 feet (3,048 meters) or below following a decompression,
shall use pressure demand breathing equipment. The appropriate pressure breathing
schedule shall be incorporated as necessary to provide altitude protection. The
crew station equipment shall support the use of pressure breathing or pressure
demand oxygen masks, regulators, hoses and any other equipment as necessary to
support this capability.
* 3.3.1.6 High altitude aircraft supply. Aircraft having a sustained flight
capability above 50,000 feet (15,240 meters), or the requirement to remain above
42,000 feet (12,081 meters) for a period over 5 minutes, but not equipped with
emergency pressurization capsule provisions, shall be provided with an installed
oxygen system designed to support high altitude pressure suits and helmets, or
pressure breathing masks and counter pressure garments, as appropriate. The
quantity shall be adequate to provide for 93-100 percent oxygen for the entire
mission, including, if appropriate, a period of oxygen breathing at ground level
prior to flight. In addition, provisions shall be made for the use of pressure
breathing masks and counter pressure garments during flight operations if
emergency descent is possible. If emergency descent is not possible for the
required mission, then a full pressure suit capability shall be provided.
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