What are the lowest ILS minimums when CL and TDZL are installed?

What are the lowest ILS minimums when CL and TDZL are installed?

• A. 1800 RVR and 200 DH
• B. 2000 RVR and 180 DH
• C. 1500 RVR and 100 DH
• D. 1800 RVR and 200 DH

Answer: (D)

Centerline lights and touchdown zone lights improve the pilot’s ability to see and align with the runway in low visibility. This enhancement lets the approach be published with lower minimums for a Category I ILS, while the decision height (DH) remains at 200 feet. With both CL and TDZL installed, the lowest published combination is an RVR of 1800 and a DH of 200 feet. That’s the point where visibility is just sufficient for a safe landing decision given the added lighting cues. The other options would imply either a much lower DH (which would push you into higher category minima) or a lower RVR that corresponds to more advanced approach categories, which isn’t applicable here.

Centerline lights and touchdown zone lights improve the pilot’s ability to see and align with the runway in low visibility. This enhancement lets the approach be published with lower minimums for a Category I ILS, while the decision height (DH) remains at 200 feet.

With both CL and TDZL installed, the lowest published combination is an RVR of 1800 and a DH of 200 feet. That’s the point where visibility is just sufficient for a safe landing decision given the added lighting cues. The other options would imply either a much lower DH (which would push you into higher category minima) or a lower RVR that corresponds to more advanced approach categories, which isn’t applicable here.