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|  MIL-N-81604C(AS)
Para 3.5.3.4
(cont)
the PSU malfunction flag will be set. This will indicate that the
battery has been totally discharged or the maximum allowable bat-
tery cell temperature reached. The battery shall be protected
from damage due to overtemperature by internal circuitry which
inhibits charging over 140F and discharging above 155F.
3.5.3.4.1 Interrupt Support .Capability - The PSU battery shall
be capable of sustaining equipment power requirements during
power interrupts as indicated in table XX.
*
INTERRUPT SUPPORT CAPABILITY
TABLE XX.
10. 0 sec
0.1 sec
1.0 sec
Interrupt Duration
5.0 sec
(Note 2)
Recharge interval to
completely recover from
72 sec
12 min
1 hour
2 hours
each interrupt.
(Note 1)
Number of interrupts
(when completely
2
10
1
charged) without re-
100
quiring a recharge
(Note 1)
interval.
The battery should be charged at temperatures less
Note 1:
than +140F and discharged at temperatures less than
+155F.
Note 2:
In flight only.
3.5.3.5 Mechanical Design
Weight - The PSU weight shall be no greater than
a.
than 17.8 pounds.
b.
Size - The PSU shall conform to the outline and
*
mounting drawing shown in' figure 24.
*
Cooling - Figures 25 and 26 specify the minimum PSU
c.
cooling air requirements and the cooling air pressure
drop.
106
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