When would you use inverted Y vs NATO T?

• A. Inverted Y almost always; NATO T only for aircraft coming in from 500 feet or higher
• B. Inverted Y almost always; NATO T only for aircraft coming in from 1000 feet or higher
• C. Inverted Y is for daytime; NATO T for nighttime
• D. Inverted Y when landing from above 100 feet; NATO T from below 100 feet

Answer: (B)

The landing zone markings are visual cues that guide a helicopter’s approach and touchdown. The inverted Y is the standard, go-to pattern because it provides a quick, easy-to-read centerline cue and orientation at typical inbound ranges. It works well for most landings, from normal approach distances and descent profiles.

The NATO T pattern is a supplemental cue used only when aircraft are coming in from longer distances, roughly around 1000 feet or higher above the ground. From that greater distance, the inverted Y alone can be harder to read, so the T shape gives pilots a clearer reference for aligning onto the touchdown axis before they descend further. That’s why it’s reserved for higher-altitude, longer-approach scenarios.

So, inverted Y almost always; NATO T only for aircraft coming in from 1000 feet or higher. The other factors (day vs night or being above vs below 100 feet) don’t determine which pattern to use.