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|  MIL-V-85830(AS)
3.10.4 Battery. The battery or batteries used to supply electrical power
to the ventilator shall be nonrechargeable. The battery design and
ampere-hour rating shall be sufficient to meet the performance requirements of
the ventilator as specified herein and provide four hours of operation for the
temperature range -4F to 122DF. Two different battery chemistries may be
used for the temperature ranges. The battery design and construction shall be
as specified in MIL-B-18 or MIL-B-49430. Lithium batteries shall conform to
NAVSEANOTE 9310. Batteries should be equiped with a blocking diode to prevent
external charging, a shunt diode to protect each cell from excessive reverse
polarity and a nonreplaceable fuse in the negative leg. Shelf life shall be
not less than two years at 68F.
3. 10.4.1 Temperate weather operations battery. The battery design and
ampere-hour rating shall be sufficient to provide 4 hours of acceptable
ventilator operation in the temperature range of +41 to 122 degrees F (5 to 50
degrees C) as specified herein.
3. 10.4.2 Cold weather operations battery. The battery design and
ampere-hour rating shall be sufficient to provide 4 hours of acceptable
ventilator operation in the temperature range of -4 to 122 degrees F (-20 to
50 degrees C) as specified herein.
3. 10.4.3 Battery test.
3. 10.4.3.1 Temperate operations. When tested as specified in 4.8.5.1, the
minimum air flow measured at the outlet of the delivery hose shall be 4.24 CFM
(120 LPM) after 4 hours.
3. 10.4.3.2 Cold weather operations. When tested as specified in 4.8.5.2,
the minimum air flow measured at the outlet of the delivery hose shall be 4.24
CFM (120 LPM) after 4 hours.
3.10.5 Switch. A two-position switch ("ON" and "OFF") shall be used to
actuate the power to the motor. The switch shall be shielded against
inadvertent actuation.
3.10.6 Power changeover jack. An external jack shall be provided to allow
the ventilator power cord to be connected to 28 volts d.c. aircraft power.
Provision shall be made to seal the jack when not in use.
3.10.7 Strap assembly. A strap assembly shall be attached to the
ventilator with a slide release buckle, to allow the aircrewman to carry the
ventilator while leaving his hands free.
3.10.8 Power cord. A power cord shall connect the ventilator to the
aircraft 28 volts d.c. power. The cord shall be 28 inches in length and be
secured to the ventilator to prevent snagging in transit. The power cord
shall terminate in a connector, straight MS3116-F-12-3P (SR).
3.11 Dimensions. The envelope dimens ons of the ventilator, complete with
filter canister(s) shall be per figure 2.
The weight of the venti ator shall be not greater than seven
3.12 Height.
pounds.
3.13 Color. The ventilator shall be colored black, approximately matching
color number 37038 as specified in FED-STD-595.
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