Safety recommendation
NTSB Recommends FAA Amend Vectoring Phrase for Terrain Clearance
The NTSB recommends the FAA update air traffic control procedures to include a specific caution phrase for certain aircraft below minimum altitudes.
The NTSB recommends that the Federal Aviation Administration amend handbook 7110.65, air traffic control, to require controllers to transmit the phrase "caution, terrain clearance not provided" when issuing a vector to a VFR aircraft, or an IFR aircraft under emergency conditions, that is below the minimum vectoring altitude or minimum IFR altitude.
Original regulatory source: https://data.ntsb.gov/carol-main-public/sr-details/A-89-116