True Air Speed Velocity Invalid Discrete

Page Title: True Air Speed Velocity Invalid Discrete - A separate signal shall
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MIL-S-85018A(AS)

3.4.3 Inputs - The system shall require the following inputs from other

aircraft equipments:

3.4.3.1 Velocity Reference - The SOARS shall require a velocity reference,

true air speed, in analog form for velocity damped Second Order operation.

3.4.3.2 True Air Speed Velocity Input - The air data system input when

provided shall be true air speed along aircraft heading in analog form. The

data processor in the Electronic Control Amplifier shall process all the true

airspeed parameters for use in the velocity damped condition.

The true airspeed signal shall have the following characteristics:

Signal Format - Analog

Source in ADC - 2K ohms linear potentiometer

Output Range - 200 to 750 knots

Output Scaling - 1.589% Vref/10 kt

Scaling Datum- 1.9% Vref - 200 kt

The potentiometer should be energized by a voltage (Vref), from the

Electronic Control Amplifier.

3.4.3.3 True Air Speed Velocity Invalid Discrete - A separate signal shall

be provided to indicate the invalidity of the true air speed data signal to the

system.

The true airspeed valid discrete shall be provided with the

following

characteristics:

Signal Format - Discrete

Source in ADC - Single Pole Switch (.5 amp rated)

Switch open circuit - TAS invalid

Switch short circuit - TAS valid

3.4.3.4 Magnetic Heading- Magnetic heading information shall be supplied

to the system by a Magnetic Azimuth Detector as described in Paragraph 6.7.

Excitation for the compass transmitter shall be supplied by the SOARS as

required by MIL-D-38134.

3.4.4 Outputs - The equipment shall provide the following outputs:

3.4.4.1 Analog Heading Output - Four synchro outputs shall be provided by

the equipment. Two external 115 V ac, 400 Hz excitations shall be required.

One excitation shall supply three of the outputs and the second excitation shall

supply the remaining heading outputs. One of the three commonly excited heading

outputs shall have a solid state output with the Z-leg grounded internal to the

Electronic Control Amplifier. The other two of the three commonly excited

outputs shall be electrically isolated from all other system outputs. The

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