Final answer:
In the ARM position, the ELT will automatically activate when an impact produces an acceleration greater than a certain value, typically around 4-6 G's.
Step-by-step explanation:
In the ARM position, the ELT (Emergency Locator Transmitter) will automatically activate when an impact produces an acceleration greater than a certain value. The exact value depends on the specific ELT model, but it is typically around 4-6 G's (where 1 G is equal to the acceleration due to gravity).
For example, if an impact produces an acceleration of 5 G's, the ELT will activate. This feature helps to ensure that the ELT is triggered in the event of a significant impact, such as in a plane crash, to aid in search and rescue operations.