Federal Aviation Regulations Practice Test

When must ELT batteries be replaced or recharged if rechargeable?

1. When the ELT has been in use for more than 1 cumulative hour

2. Every 6 months regardless of use

3. When the ELT is activated

4. After one year of operation

The correct answer is: When the ELT has been in use for more than 1 cumulative hour

The requirement for replacing or recharging Emergency Locator Transmitter (ELT) batteries is grounded in ensuring that the equipment remains functional and reliable in emergencies. The correct answer indicates that batteries must be replaced or recharged if the ELT has been in use for more than 1 cumulative hour. This guideline aims to maintain the operational capability of the ELT, as any extended use can deplete the battery's reserve power, diminishing the transmitter's effectiveness in an emergency situation. In contrast, other options do not accurately reflect the specific regulatory requirements. Replacing batteries every 6 months regardless of use does not consider the operational status of the ELT, which could lead to unnecessary maintenance. The condition regarding activation of the ELT would be insufficient, as it does not account for cumulative use time. Similarly, waiting for one year of operation can risk battery reliability since a battery may become depleted long before that time, especially if the ELT has been activated. Thus, monitoring usage is essential for ensuring that the ELT remains ready for emergency deployment.