TASK 1155

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.