Final answer:
Aural advisories are inhibited below 1000 feet while descending, and below 500 feet while climbing.
Step-by-step explanation:
In the context of TCAS and TO 1E-8C-1, all aural advisories (TA and RA) are inhibited below 1000 feet while descending, and inhibited below 500 feet while climbing.
This means that when an aircraft is descending, aural advisories are not provided if the altitude is below 1000 feet. Likewise, when an aircraft is climbing, aural advisories are not provided if the altitude is below 500 feet.
For example, if an aircraft is descending and reaches an altitude of 800 feet, no aural advisories will be heard. Similarly, if an aircraft is climbing and reaches an altitude of 400 feet, no aural advisories will be heard.