When is the INST Holdline activated?

When is the INST Holdline activated?

• A. When ILS critical areas weather minimums are reached
• B. When tower clears to enter the runway
• C. When the runway is closed
• D. When aircraft commence takeoff

Answer: (A)

The INST Holdline is activated to protect the ILS critical area during instrument operations, specifically when the weather meets the published minimums for that area. When the reported ceiling and visibility reach those ILS critical area minimums, pilots are required to hold at the instrument holdline until conditions improve or ATC clears them to proceed. This ensures the ILS signals remain protected and that approach operations can proceed safely in reduced visibility. It isn’t triggered by a tower clearance to enter the runway, a runway closure, or aircraft starting takeoff.

The INST Holdline is activated to protect the ILS critical area during instrument operations, specifically when the weather meets the published minimums for that area. When the reported ceiling and visibility reach those ILS critical area minimums, pilots are required to hold at the instrument holdline until conditions improve or ATC clears them to proceed. This ensures the ILS signals remain protected and that approach operations can proceed safely in reduced visibility. It isn’t triggered by a tower clearance to enter the runway, a runway closure, or aircraft starting takeoff.