Is it true that unless conducting rescue operations, a pilot should not operate within 50NM of known or reported hazardous volcanic ash?

The statement is true. Pilots are advised to avoid flying within 50 nautical miles of known or reported hazardous volcanic ash. This precaution is in place because volcanic ash can severely affect aircraft performance, causing engine failures, reduced visibility, and other critical safety issues.

Volcanic ash can damage engines, impair flight controls, and lead to hazardous inflight conditions. As a result, when ash is in the vicinity, it is crucial for pilots to maintain a safe distance to mitigate the risks associated with ash clouds. The operational guidelines aim to ensure that non-rescue flights prioritize safety by avoiding regions where volcanic activity poses a threat.

Therefore, conducting operations outside this exclusion zone unless specifically required for rescue missions underscores the emphasis on safety, confirming the correct answer.