text: Helicopter Landing Zones
  4-67. Pathfinders display an inverted "Y" for cargo aircraft. This marker consists of five lights.
  Pathfinders place the fifth light IAW prior coordination with the supporting aviation unit (Figure 4-19).
  The fifth light can go 7 meters from furthest stem light in the direction of landing, or 10 meters opposite
  the landing direction (below) the right flank light.
  Figure 4-19. Placement of fifth light using inverted "Y," when coordinated.
  4-68. Pathfinders will display a NATO landing "T" if an aircraft approaches the LZ from at least 500
  above ground level (AGL), or anytime the pathfinders coordinate in advance with the supporting
  aviation unit.
  4-69. Noncargo aircraft require a 5-meter separation between touchdown point and lights, with a 5-meter
  separation between lights.
  4-70. Cargo aircraft require a 10-meter separation between touchdown point and lights, with a 10-meter
  separation between the lights.
  4-71. During darkness, helicopters approach slightly steeper and slower than they would in daylight.
  4-72. Vehicle headlights offer one kind of emergency night lighting. Pathfinders place two vehicles
  about 35 meters apart and 35 meters downwind of the landing point. They shine their headlights so that
  their beams intersect at the center of the landing point (Figure 4-20). The helicopter approaches into the
  wind, passes between the vehicles, and lands in the lighted area. This method does not work well for large
  helicopters.
  Figure 4-20. Emergency night lighting by vehicle headlights.