(Photo Credit: U.S. Army) VIEW ORIGINAL

Ask any pilot or crewmember what their biggest hazard to flight would be and you can expect a few different answers: birds, other aircraft or weather. What about wires? Pilots and crewmembers are taught the hazards to terrain flight during primary and tactical training. As a rule of thumb, we were told that “all roads have wires,” but that has not prevented countless flight crews coming into contact with wires. As we have reviewed the data over the last 10 years, it is pretty interesting what it tells us about the overconfidence and complacency of our flight crews. We need to look at a few things that will help us prevent the next wire strike.

Terrain flight includes appropriate tactical application of low-level, contour and nap-of-the-earth (NOE) flight techniques as appropriate, diminishing the enemy’s capability to acquire, track and engage aircraft. For night vision device (NVD) training, terrain flight is conducted at 200 feet or less above the highest obstacle. Altitude and airspeed restrictions — for NVD flight training — are listed with the description of each mode. There are physical hazards that flight crews must be aware of, which are divided into manmade and natural. Aviators must be proficient in flight navigation map reading, preparation and terrain interpretation before entering these modes of flight to mitigate wire and other hazards to flight.

Pre-mission planning and rehearsals

Pre-mission planning and rehearsals require pilots to anticipate wires associated with all roads, towers and buildings in open fields. When time and mission allow, reconnaissance of the flight route, regardless of it being an approved established NOE route, is recommended. Review of the data shows that 39% of the wire strikes occurred on an approved NOE route or within designated terrain flight training areas.

Data points

From fiscal years 2012-21, there were 18 reported wire-strike mishaps — three Class A with two fatalities, three Class B, five Class C, three Class D and four Class E. Eleven occurred during day operations, five under NVDs and two at dusk. A breakdown by type of aircraft showed nine AH-64s, five H-60s, one CH-47, one H-6, one UH-1 and one UH-72. Six of the mishaps occurred in the fiscal 2012-16 timeframe, with 12 incidents from fiscal 2017-21. The number of wire strikes doubled in the last five years compared to the previous five years. What caused the increase? A portion of these mishaps happened in our own backyards. Are we complacent or overconfident while operating in our local area and let down our guard?

Seven steps for wire-strike prevention

Here are a few tips to assist you in preventing the next wire strike. If these seven simple steps are implemented and followed, you can drastically improve your chances of avoiding injury to your flight crews or damaging your aircraft. Think about each of these steps before your next flight.

  1. Standard operating procedures, training support packages and directives
  2. Supervision
  3. Hazard maps
  4. Wire marking
  5. Plan for terrain flight
  6. Maximum crew coordination preparation and execution
  7. Go slow when you go low

Summary

Aviators need to remember these mishaps occur due to omission of a thorough hazards review and failure to implement controls to mitigate the risk. The hazard review and control implementation should be a major portion of the pre-mission planning. A dynamic rehearsal should be conducted reflecting the hazards and the controls. Please enforce the standards and you can maximize your team’s ability to avoid the next mishap. Each of us can make a difference.

 

References:

Army Techniques Publication 3-04.1, Aviation Tactical Employment

Training Circular 3-04.4, Fundamentals of Flight