Which of the following precautions is necessary for the ELT C?

The necessary precaution for the ELT C (Emergency Locator Transmitter) is that it should not be submerged under water for extended periods. This guideline is primarily based on the design and functionality of the device. Although the ELT C is built to withstand various environmental conditions, excessive exposure to water can impact its electrical components and battery life, potentially compromising its effectiveness in emergency situations.

The device is intended to activate and transmit a distress signal when needed, and submersion may hinder its ability to perform as intended. It is crucial for the operating integrity of the device that precautions regarding water exposure are adhered to, ensuring reliable operation when activated in case of an emergency.