B - The Remote Indicating Compass (05-06-18)

Question 1

What is the purpose of the remote indicating compass?

Answer 1

It combines the long term accuracy of the DRMC with the short term accuracy of the DGI

Question 2

What is the flux valve of a RIC?

Answer 2

A component which is pendulously pivoted at a point along the span of the tailplane, that is able to measure the actual magnetic direction of the aircraft.

Question 3

How is the flux valve mounted?

Answer 3

On a hooks joint with a 2 way hinge.

it is fixed in azimuth (yaw)

Question 4

What are the maneouvre limits for the flax valve of a RIC?

Answer 4

+/- 25deg in roll or pitch

Question 5

What are the errors associated with a RIC?

Answer 5

All small enough to not cause concern:

Accelleration

Turning

Attitude

Deviation (however much less than a DRMC)

Question 6

What is the process that slaves the heading of a RIC to magnetic heading and what is the slave rate?

Answer 6

Flux gate on wing measures actual mag hdg

coils and wires take current to error detector inside instrument

if the error detector detects an error then a signal is sent to an amplifier

The amplifier sends a current to a precession motor which turns the gyro.

slave rate is 3deg/min

Question 7

What is a way to slave a RIC quicker when quicker?

Answer 7

A high gain amplifier option which slaves at 60deg/min

Question 8

What is the primary function of the annunciator in a RIC?

Answer 8

Tells you if there is an error due to showing you any current flow to the torque motor.

Question 9

How can an annunciator show a failure in a RIC slaving system?

Answer 9

The needle remains perfectly still.