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|  MIL-N-81497A(AS)
3.4.3.4.4 (Continued)
(15) Velocity Sign Bit -
1 represents (-) negative velocity:
(a)
South or West
(b) 0 represents (+) positive velocity:
North or East
(16) Most Significant Bit (MSB) Scaling -
= 540.10664 FT\SEC
(a) Velocity:
= 180 DEG
(b) Heading:
(17) All negative numbers are in two's complement.
Negative numbers represent South or West
velocities.
(18) Velocity Update Rate - 5 times/SEC
(19) True Heading Update Rate - 20 times\SEC
Attitude/Unavailable Relay -
3.4.3.4.5
(1) open contacts at the Control, Gyroscope
Assembly due to:
System Failure
System in Alignment Process
System in Standby or Compass Mode
System is Off
Navigation Computer program has stopped
All other times, circuit is closed.
Maximum current rating: 1 ampere
(2)
(resistive)at 28V DC
(3)
Contact closure not influenced by power
interrupts of less than 10 SEC.
Inertial Mode Relay -
3.4.3.4.6
(1)
Closed contacts at Control, Gyroscope Assembly
when INS is in the Inertial Mode. In all
other modes, circuit is open.
25
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