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|  MIL-N-81604C(AS)
Para 3.3.10 (cont)
be limited to 160F. The high temperature requirements for the
*
PSU battery shall be limited as stated in 3.3.10.2.
3.3.10.1 Vibration - The airborne equipment shall operate satis-
factorily when subjected to the vibration requirements of Curves
I and 11 of MIL-E-5400, with Curve I extended to 2,000 Hz at the
10g level.
3.3.10.2 Temperature - For MIL-E-5400, Table 1, Column II inter-
mittent operation,the IMU accuracy may be degraded for inlet
cooling air conditions outside the design criteria specified in
figures 20 and 21. High temperature requirements for the PSU
battery shall be limited to the following maximum temperatures:
a.
Equipment Operating
Continuous/intermittent:
+68C (154.4F)
+68C (154.4F)
Temperature shock:
b.
Equipment Operating (Battery Charge Only)
+60C (140F)
Continuous/intermittent:
Temperature shock:
+60C (140F)
Equipment Nonoperating
c.
O
0
+71O C (162.5 F)
Temperature extremes:
+71 C (162.5F)
Temperature shock:
3.3.11 Alignment Time - The equipment shall have an inherent
capability to warm up and align to meet the specified navigation
accuracy requirements within 5 minutes. System alignment time
may vary as a function of the computer alignment software mechan-
ization utilized. Using the Maximum Likelihood-Kalman filter
(MLF-K) type of alignment software mechanization, the mean time
required for the system to align under various conditions shall
be as follows:
Under carrier operational conditions where ambient
a.
temperature exceeds 50F, the alignment time shall be
less than 10 minutes and may increase linearly to 12
minutes dwn to 65F. The Ships Inertial Navigation
System (SINS) shall operate within the requirements
of AR-57A with a data validity of 99.5 percent
throughout the alignment period.
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