What is one necessary precaution before removing an engine?

Disconnecting the battery is a crucial safety measure before removing an engine. This precaution is taken to eliminate the risk of electrical shocks or short circuits that could occur while working on the engine. Batteries can carry a significant amount of voltage and current, which, if accidentally contacted during the removal process, may lead to serious injury or damage to electrical systems.

By ensuring that the battery is disconnected, the technician can work safely without the risk of unintended electrical activity. This step is particularly important in modern aircraft with complex electronic systems where contact can result in costly repairs or unsafe conditions.

While securing the engine mount, draining fluids, and removing the engine cover may be necessary steps in the process, they do not address the immediate electrical safety concerns that disconnection of the battery ensures before any further work is performed.