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|  MIL-D-19326H
3.6.1.1 Removable converters. Where removable converters are to be installed
in any oxygen system, the converters shall be in accordance with MIL-C-19803 or
MIL-C- 19328, as applicable. The installation shall provide for simple and rapid
replacement. The converter shall be capable of being removed from the aircraft
and replaced within five minutes.
3.6,1.2 Permanently installed converters. Where permanently installed
converters are to be put in any oxygen system, the converters shall be in
accordance with MIL-C-25666.
3.6.1.3 Converter mounting. The converter shall be mounted in such a manner,
that it is readily accessible to servicing personnel. The converter shall be
mounted so that the converter base is within 5 degrees of horizontal when the
aircraft is in the normal cruise attitude.
3.6.1.3.1 Converter mounting bracket configuration (removable converters).
The configuration of the bracket necessary to mount each converter in the aircraft
shall be provided in accordance with MS90341.
3.6.1.4 Dummy converter. For aircraft utilizing more than one liquid oxygen
converter, a dummy converter (an electrical equivalent to the empty converter)
shall be permanently installed adjacent to each converter in the aircraft. The
dummy converter shall be used whenever a converter is removed from the aircraft to
insure proper operation of the gauging system. The dummy converter shall be in
accordance with MIL-D-26392 or MIL-D-26393, as applicable.
3.6.2 Liquid oxygen quantity indicator. Quantity indicators shall be
installed using the parameters outlined in 3.5.1. The quatity indicator shall
indicate the amount of liquid oxygen in the converter or converters.
* 3.6.2.1 Indicator location. The quantity indicator shall be connected into
the system as shown in Figures 2 through 8. The indicator shall be located in the
pilot's or co-pilot's (or other crewmember's) normal field of vision so that he
may readily see the indicator when in normal operating or flight position without
turning his head and with minimum interference to his flight duties,
3.6.2.2 Press-to-test. A press-to-test switch in accordance with MIL-S-8805/3
shall be located near each liquid oxygen quantity indicator. This switch shall
allow the indicator to be functionally checked in accordance with 4.5.6.1.
* 3.6.2.3 Low pressure, low-level warning system. A low pressure, low-level
warning light shall be Incorporated near each quantity indicator and into the
"Caution" enunciator panel. The low pressure warning-shall be activated when the
converter system pressure drops to 42 + 2 psig (290 + 14 kPa). For each crew
station in a 70 psig (483 kPa) oxygen system, the pressure sensor shall be located
downstream of the on-off valve. If an oxygen regulator in accordance with MIL-R-
2541O is used, the pressure sensor shall be located upstream of the regulator.
The momentary drop in supply line pressure upon inhalation shall not activate the
low pressure warning. The low-level warning shall be actuated at and below 10
percent of the full scale of the quantity indicator.
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