Exract: TC 1-211 AIRCREW TRAINING MANUAL UTILITY HELICOPTER, UH-1H/V SERIES TASK 1155 NEGOTIATE WIRE OBSTACLES CONDITIONS: In a UH-1 helicopter. STANDARDS: Appropriate common standards plus these additions/modifications: 1. Locate and estimate the height of wires. 2. Determine the best method to negotiate the wire obstacle. 3. Safely negotiate the wire obstacle, minimizing the time unmasked. DESCRIPTION: 1. Crew actions. a. The pilot on the controls (P*) will remain focused primarily outside the aircraft and will announce visual contact with wires and supporting structures. b. The pilot not on the controls (P) and nonrated crewmember (NCM) will announce visual contact with wires and supporting structures. They will also provide adequate warning to avoid hazards, wires, poles, or supporting structures. They will announce when the aircraft is clear and when their attention is focused inside the aircraft and again when attention is reestablished outside. 2. Procedures. a. Announce when wires are seen. Confirm the location of wire obstacles with other crewmembers. Announce the method of negotiating the wires and when the maneuver is initiated. b. Discuss the characteristics of wires and estimate the amount of available clearance between them and the ground to determine the method of crossing. Locate guy wires and supporting poles. (1) Overflight. Before crossing the wires, identify the highest wire. Cross near a pole to aid in visual perception and minimize the time that the aircraft is unmasked. (2) Underflight/ground taxi. When under flying wires, there must be a minimum ground to wire clearance of hover height plus 25 feet. Ground speed should be no greater than that of a brisk walk. Ensure lateral clearance from guy wires and poles. If terrain is suitable, consideration should be given to ground taxiing under the wires. Note: The crew must maintain proper scanning techniques to ensure obstacle avoidance and aircraft clearance. NIGHT OR NIGHT VISION GOGGLE CONSIDERATIONS: Wires are difficult to detect at night and with NVGs. Underflight of wires should not be performed at night or while using NVGs, unless the location has been checked during daylight conditions and all hazards have been identified. TRAINING AND EVALUATION REQUIREMENTS: 1. Training will be conducted in the aircraft. 2. Evaluation will be conducted in the aircraft. REFERENCES: Appropriate common references.