How should a pilot react to a loss of navigation signal in IFR conditions?

When a pilot experiences a loss of navigation signal while flying under Instrument Flight Rules (IFR), the most appropriate and safe reaction is to request immediate assistance from Air Traffic Control (ATC). In IFR conditions, pilots are dependent on navigation aids and ATC for safe navigation and separation from other aircraft. Upon recognizing the signal loss, it is crucial to communicate this to ATC, as they can provide guidance, help in determining the aircraft's position, and offer alternative navigation instructions.

This request for assistance allows for a coordinated response, ensuring safety and maintaining situational awareness. ATC has the tools and resources to assist the pilot in navigating through the situation, including vectors to a safe landing or instructions to regain navigation.

In contrast, continuing the flight as planned could lead to dangerous situations if the pilot cannot reintegrate navigation signals. Reverting to Visual Flight Rules (VFR) may also not be feasible or safe in instrument meteorological conditions. Adjusting heading and altitude could be dangerous without accurate navigation information, as it may not lead to a safe outcome. Therefore, seeking immediate assistance is the most prudent course of action in this scenario.