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|  MIL-D-19326H
3.4.2.1 Maximum number of converters. In the event the aircraft performance
is such that the number of converters required becomes excessive so that the
installation becomes impractical, the acquiring activity shall specify the maximum
number of converters (see 6.2c).
* 3.5 System layout. Typical oxygen systems for various types of pressurized or
nonpressurized aircraft are shown on Figures 2 through 8, inclusive. These
figures represent the general arrangement of the systems; the actual number,
location, and application of these items are determined by the aircraft
characteristics and the requirements specified herein.
* 3.5.1 Total quantity indicators. For US Navy application, a totalizing
quantity indicator shall be installed at the pilot's or co-pilot's station of the
aircraft in which more than one converter is installed. This will permit
monitoring of the total aircraft oxygen supply. Repeater indicators shall be
provided in all isolated flight compartments within normal vision of one
crewmember. Liquid oxygen quantity indicators shall be in accordance with MIL-I-
81387 or MIL-I-25645, as applicable. Liquid oxygen quantity indicator repeaters
shall be in accordance with MIL-I-81388 or MIL-I-25645, as applicable.
* 3.5.1.1 Separate quantity indication.
For USAF application, at least one
quanity indication shall be provided for each converter installed on the
aircraft. The procuring activity shall determine the most effective means of
liquid quantity indication (see 6.2d). This may be accomplished by the use of a
separate indicator for each liquid oxygen converter or by the use of one indicator
with a switch to select the indication of each converter. The indicator shall be
correlated and labeled with the liquid oxygen converter that it applies to such
that it may be easily determined which converter the indicator is used with. The
quantity indicator(s) shall be installed at the crew station of the crewmember(s)
designated as responsible for the oxygen system [i.e., pilot, co-pilot, flight
engineer, loadmaster). Repeater indicators may also be provided in isolated
flight compartments. If they are provided at other crew stations, they shall be
within visual range arid readable by that crewmember while seated. Other crew
stations on large transport aircraft may be the flight engineer, loadmaster, the
head nurse or the flight steward station. Liquid oxygen quantity indicators shall
be in accordance with MIL-I-81387 or MIL-I-25645, as applicable. Liquid oxygen
quantity indicator repeaters shall be in accordance with MIL-I-81388 or MIL-I-
25645, as applicable.
* 3.5.2 Single converter, single place aircraft. When only one converter is
installed in the aircraft and there is only one crewmember, the system shall be
connected in accordance with Figures 2 and 3.
* 3.5.3 Single converter with multiple crew stations. When only one converter
is installed in the aircraft and there are two or more permanent crew stations,
all stations shall be connected to the same distribution line in accordance with
Figures 4, 5 and 6.
* 3.5.4 Multiple converters with multiple crew stations. When two or more
liquid oxygen converters are installed in an aircraft, all converters shall be of
the same size and have the same operating pressure, with the exception of
transport aircraft that divide oxygen supply between the flight crew and
passengers, then the converters may be different sizes. Multiple converters for
the passengers shall still be the same size. Converters shall be manifolded for
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