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Page Title:
Primary Input Power Requirements |
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|  MIL-N-81497A(AS)
Primary Input Power Requirements - The equipment
3.3.12
Shall meet all applicable requirements of MIL-STD-704 and shall give
specified performance from the following power sources with charact-
eristics as defined in MIL-STD-704 having limits as specified therein.
The power required shall not exceed the specified amounts.
AC Power (three phase); l15\200V, 400 Hz,
(1)
Category B, 660 voltamperes (VA) operating
AC power (three phase); 115/200V, 400 Hz,
(2)
Category B, 1000 VA heater power (maximum),
phase (load) balance shall be within 400 VA
V, 400 Hz,
AC Power (single phase);
(3)
27 volt amperes synchro power (maximum)
DC Power, 28 V, Category B; 2 amperes (maxi-
(4)
mum)
(5)
DC Power, 18 V, Category B, 1.2 ampere (maxi-
mum) advisory lamp excitation for Control,
Gyroscope Assembly and Indicator, Position
AC Power, 5 to 28 V variable, (Single Phase)
(6)
Category A, 400 Hz for control panel edge
lighting; 25 VA (maximum)
DC Power, 28 V DC, Category B, 0.2 ampere
(7)
(maximum) for press to test lamp excitation
function
DC power, 28 V DC or 9 V DC (for annunciator
(8)
and advisory lamps on the Control, Navigation),
Category B, 0.2 ampere for 28 V DC, 0.1 ampere
for 9 V-DC
Degraded Performance - The system shall be capable
3.3.12.1
of operation under the lnfluence of AC transients as defined in
MIL-STD-704 for Category B equipment. It shall be capable of operation
under the influence of DC voltage transients as defined on Figure 6
of MIL-STD-704. The equipment shall contain a battery which shall
maintain operation of the equipment within the limits specified herein
for periods of abnormal aircraft electrical system operation or power
interruptions of up to 10 SEC in duration. Operation during this
period shall be limited to those functions specified herein (see 3.4.1.3).
For power interruptions, as defined by MIL-STD-704, in excess of 10 SEC,
the equipment shall receive from external sources a power off signal
which shall be used within the equipment to initiate an automatic
shutoff procedure.
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