What indicates a loss of nose wheel steering (NWS)?

The correct answer highlights that the pilot will flash the taxi light as an indication of a loss of nose wheel steering (NWS). This is an essential communication signal used by pilots to alert ground personnel and the tower of an issue with steering, signaling a potential problem that could impede safe taxiing of the aircraft. The flashing taxi light serves as a clear visual cue that prompts immediate attention to resolve the situation.

In the context of loss of NWS, other indicators such as airframe vibration or fluid leakage can describe different mechanical issues or malfunctions but do not specifically relate to a loss of nose wheel steering. A change in altitude is also unrelated as it pertains to vertical positioning in flight rather than steering control during taxi operations. Hence, the flashing taxi light becomes a critical alert mechanism for identifying and addressing a loss of nose wheel steering effectively.