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|  MIL-N-81497A(AS)
3.5
Detailed Requirements.
Control, Navigation C7561\ASN-84 - The Control,
3.5.1
Navigation unit shall meet the following requirements.
Function - The Control, Navigation shall contain
3.5.1.1
all the controls and indicators which are necessary to permit the
operator to have complete control over the modes of operation of the
INS as described herein.
Form Factor - Form factor of the equipment shall
3.5.1.2
conform to EI-554. Maximum envelope dimensions shall be 3.86 inches
by 5.75 inches by 3 inches.
Weight - The weight of the Control, Navigation
3.5.1.3
shall not exceed 1.55 pounds.
Contents of Unit - The Control, Navigation shall
3.5.1.4
contain the following major subassemblies:
Nomenclature
Quantity
Backup Latitude Thumbwheel
4
Switches
Backup Latitude Register
1
Electronics
Mode Selector Switch
1
1
Grid Heading Slew Switch
1
Synchronization DC Meter
1
Push to Start Switch
Panel, Front
1
Indicator lamps (ON, SYSTEM
4
FAIL, ALIGN, TEST)
Lamp Driver Electronic Circuits
3
Adjustment Controls - All adjustment controls shall
3.5.1.5
be accessible from the front of the Control, Navigation. The following
control functions shall be available on the front panel (see Figure 2).
3.5.1.5.1
Mode Selector Switch - The Mode Selector shall be
a 5 position detented switch which shall be used to select the modes
of operation (Standby, Inertial, Slave, Free, Compass) of the equipment.
Switch design shall be such as to mechanically inhibit an inadvertent
selection of Standby after operation in Inertial, Slave, Free or
Compass modes.
27
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