Magnetic Compass a primary bank instrument???

[dtuuri]

I thought of this thread as I ran across a related test question in preparing for the written.

This post makes me think of post #20 in this thread:

<snip>Here's a sample question from their test bank in the past:

The gyroscopic heading indicator is inoperative. What is the primary bank instrument in unaccelerated straight-and-level flight?
A: Magnetic compass.
B: Attitude indicator.
C: Miniature aircraft of turn coordinator.
​

A “primary” instrument relates to the current objective and is the instrument that measures whether the objective is being met at that instant. If the heading indicator, when it is primary, becomes inoperative, the stand-by compass comes off the bench to substitute as the primary.

dtuuri

 

[eetrojan]

This post makes me think of post #20 in this thread:

Oops. But, but... mine is more colorful!

 

[poadeleted20]

All of which goes to show why primary/supporting is so hard to wrap your head around.