Definition
In the TFR context, security investigations are formal inquiries conducted by federal law enforcement or national security agencies into possible threats to people, property, or national security. The FAA may issue a Temporary Flight Restriction to protect the airspace over the location where such an investigation is taking place, keeping non-participating aircraft clear of the area.
Plain English
Official inquiries by agencies like the FBI or Secret Service into possible threats. When one is happening on the ground, the FAA can close the airspace above it so aircraft don't interfere or get in the way.
Context Anchor
Seen in temporary flight restriction notices, preflight briefings, and flight planning when an area of airspace is limited for security reasons.
Derivation
Security comes from a Latin word meaning “free from care or danger.” Investigation comes from a Latin word meaning “to track or search into.” Together, the phrase points to official work being done to find out whether there is a danger and how to handle it.
Why Pilots Care
Pilots must check NOTAMs and avoid these areas to prevent violations and enforcement actions.
Intuition Check
Do not read security investigations as a background check on the pilot. In this context, it means an active official security matter on the ground or in the air that may require keeping aircraft away.
Example Sentence 1
The pilot rerouted around a TFR that had been issued to support ongoing security investigations near the city center.
Example Sentence 2
Pilots planning flights near the event checked for any security investigations that could affect their route.