ASN-179 INS

Question 0

The BATT light on the MSU illuminates to indicate________.

Answer 0

the backup dc voltage(FEDC bus) is in use.

Question 1

Attitude reference mode is normally selected when navigation capability is lost. In this mode, the system only provides_____________.

Answer 1

Platform heading and pitch and roll attitude signals.

Question 2

What components are located inside the INU?

Answer 2

1. inertial platform
   a. 3 orthogonal Zero-lock laser
   Gyros
   b. 3 axis A-4 triad accelerometer
2. Digital computer
3. Inertial power supply
4. Digital subsystem modules

Question 3

What are the four primary functions of the INU?

Answer 3

1. Determines the angular orientation and horizontal velocity of the aircraft.
2. Determines the ground speed and drift angle of the aircraft.
3. Determines geographic position of the aircraft.
4. Serves as the bus controller for ARINC navigation data buses.

Question 4

What does the Slaved positions do for MHRS?

Answer 4

Enables the compass couplers to stabilize signals supplied by the flux valve with the platform heading from INU.

Question 5

What does the DG position do for MHRS?

Answer 5

References all outputs to the platform heading that takes place of a directional gyro system.

Question 6

What is the function of the DDU?

Answer 6

Translates the INS data into a format capable of being processed by the central computer.

Question 7

When does the INS automatically enter a closed loop update with the GPS?

Answer 7

Status 70 if the GPS is installed and turned on.

Question 8

What two alignment methods are not available without ARN-151 GPS?

Answer 8

Hybrid and In-flight

Question 9

Does the normal alignment require ARN-151 GPS?

Answer 9

No

Question 10

What happens at STS 60 of the alignment process?

Answer 10

Automatic test of system alignment is made. If test fails the WARN indicator flashes.