15 - 13 (1) The size, slope, amount of surface debris, and the area covered by shadows and obstacles in and around the site. (2) The approximate direction, speed, and characteristics of the wind. (3) The inbound route, if necessary. When the pilot cannot land due to a steep slope, the aircraft may terminate at a hover to off load troops and supplies. (4) The departure route, which should orient into the wind and over the lowest obstacles. 15-9. OBSERVATION HELICOPTERS. This category includes the OH 58D Kiowa and the OH 6A Cayuse. a. OH 58D Kiowa. Table 15-3 shows specifications for the Kiowa; Figure 15-14 shows the aircraft from three angles. Table 15-3. SPECIFICATIONS FOR THE OH 58D (KIOWA) Rotor Diameter 35 feet Length: Rotor Operating Blades Removed 42 feet 2 inches 33 feet 10 inches Height to Top of Turret 12 feet 9-1/2 inches Tread (Skids) 6 feet 2 inches Main Rotor Disk Area Blade Area 0.962 square feet 38.26 square feet Clear Area Needed for Rotor 12.5 meters TDP # 1 25 meters diameter Figure 15-14. OH 58D (KIOWA)