MH/T 1064.7-2017Safety code of power working with the helicopter. Part 7-Paying off guide rope work (English PDF)

4.1 Personnel

4.1.1 Staff composition

4.1.1.1 The operators of the guide rope of the helicopter deployment are divided into flight operators and construction operators.

4.1.1.2 The flight operator includes the operation team (pilot, co-pilot, on-board operators, operation controller, aircraft maintenance personnel, fuel Personnel), ground operations command, etc., if necessary, interpreters can be configured.

4.1.1.3 The construction operators include ground construction personnel, tower construction personnel, ground commanders, security personnel, etc.

4.1.2 Driver qualification

4.1.2.1 The captain performing the helicopter deployment guide rope operation shall meet the following requirements.

--Have experience in suspending helicopter external loads;

--Not less than 2 000 h for helicopters;

--Long time of operation model not less than 100 h;

--At least 100 hours of low-altitude flight experience, including electric power operation flight experience;

--Not less than 30 hours of professional flight training time for guiding ropes.

4.1.2.2 The co-pilot performing the pilot rope operation of the helicopter deployment shall meet the following requirements.

--Have experience in suspending helicopter external loads;

--Not less than 500 h low altitude flight experience, including electric power operation flight experience;

--Not less than 10 hours of professional flight training time for guiding ropes.

4.1.3 Qualifications of the person in charge of work (or safety guardian)

The person in charge (or safety guardian) who performs the guide rope operation of the helicopter exhibition shall meet the following requirements.

--Have more than 3 years of practical experience in the construction of overhead transmission lines under tension;

--Familiar with equipment conditions, with certain organizational skills and accident handling capabilities.

4.1.4 Division of Responsibilities

The flight operator is responsible for the safety of the work hook and above, and the construction operator is responsible for the safety of the work below the hook.

4.2 Equipment

4.2.1 When selecting a helicopter, its performance parameters, guiding rope parameters, and setting-off section conditions should be considered comprehensively, and after a technical and economic comparison determine.

4.2.2 The selection of the guide rope should comprehensively consider its unit weight, breaking force and other parameters, and should be based on the needs and the line crossing situation and the helicopter's allowable mounting capacity are determined, and the selection is made according to the requirements in DL/T 5286 and DL/T 5290.

4.2.3 The selection of supporting tools and instruments should match the guide rope specifications, construction task requirements, etc., and should pass inspections or tests to ensure their installation it is safe to use and meets the requirements of DL/T 875.

4.2.4 The maximum continuous pay-off speed of the tension machine should not exceed 250 m/min.

4.2.5 Helicopter take-off and landing field, tension field, and towing field should each be equipped with at least one air-to-ground radio station for use by flight operators. Pay-off area the construction personnel on each tower in the section and the security personnel of the ground crossing monitoring point shall be equipped with walkie-talkies.

4.3 Operating environment and weather

The operation should be carried out under good weather conditions, the visibility under the operation cloud should be no less than 3 km, and the wind speed should be no more than 3 m/s.

4.4 Personnel fatigue prevention measures

4.4.1 The driver should maintain a good physical and mental state and show no signs of fatigue before starting to deploy the guide rope.

4.4.2 The working hours of crew members should not exceed 14 hours throughout the day.

4.4.3 During any continuous 24 hours, the accumulated flight time should not exceed 8 hours.

4.4.4 Within 7 consecutive days, the accumulated flight time should not exceed 40 hours.

4.4.5 In a calendar month, the accumulated flight time should not exceed 120 hours.

5.1 Preparation stage

5.1.1 Technical preparation

5.1.1.1 The project management implementation plan for the helicopter display guide rope and the technical plan for the helicopter display guide rope operation shall be formulated according to the project content and helicopter display guide rope aerial flight operation instructions.

5.1.1.2 Prior to operation, technical safety clarifications should be made to clarify the division of responsibilities and safety emergency measures.

5.1.2 Leapfrog preparation

Before operation, a spanning frame should be set up for important spans in the pay-off section in accordance with DL 5009.2.

5.1.3 Takeoff and landing

The ground of the take-off and landing site should be level and hardened appropriately according to the situation to prevent dust.

5.1.4 Machine preparation

According to the requirements of the construction plan, the helicopter and its supporting equipment should be equipped, and the inspection and test should be passed to ensure safety and reliability.

5.1.5 Personnel preparation

5.1.5.1 The construction personnel on the tower shall be certified to work, have certain experience in high-altitude operations, and shall wear wind-proof and fall-proof safety equipment.

5.1.5.2 The personnel on board the helicopter and the construction personnel on the tower shall carry out hand signal communication training. Refer to Appendix A for various signal gestures A.1.

5.1.6 Preparation of communication equipment

Before the operation, the communication equipment and facilities (such as aviation helmet with intercom function, communication radio, walkie-talkie, etc.) required during the operation shall be carried out.

Check to make sure it is in normal working condition.

5.2 Direct preparation phase

5.2.1 The crew should understand the flight dynamics of the flight area and obtain the latest aeronautical information, communications and navigation data.

5.2.2 The crew should go through relevant procedures such as the flight mission statement and the flight release form.

5.2.3 Before operation, the guide rope should be tightly wound on the special spool layer by layer.

5.2.4 The construction personnel shall install and debug the supporting tools and instruments to ensure normal operation.

5.2.5 The person in charge of the construction work before the helicopter takes off should talk to the construction personnel on the tower of each base iron tower, and verify the monitoring on the tower and the ground on each tower.

The presence of control point personnel and the completion of various preparations.

5.2.6 Sprinkle water around the helicopter landing site to reduce dust.

6.1 Placement method operation

6.1.1 Guide rope anchorage

6.1.1.1 Before unfolding, the end of the first axis guide rope should be anchored to the ground and ensured to be firm and reliable.

6.1.1.2 In the process of laying the guide rope, the tension of the guide rope should be controlled to keep the guide rope empty.

6.1.2 Guide rope into the tackle

6.1.2.1 When the helicopter flies over the tower and puts the guide rope into the pulley groove, the operator should be in a safe position and should ensure that the pulley and the the guide rope clamps are all opened.

6.1.2.2 The height of the guide rope axis from the top of the tower shall not be less than 5 m.

6.1.3 Helicopter tight line

When adjusting the tension control device of the helicopter to tighten the line, make sure that the guide rope has been placed in the overhead tackle.

6.1.4 Anchorage on the guide rope tower

When the helicopter flies over the corner tower, the line should be tightened along the direction of the flying line first, and the guide rope should be anchored by the operators on the tower before turning back Continue to fly to the center line of the route.

6.1.5 Replacing the guide rope spool

After the one-axis guide rope is unfolded, its tail end should be dropped naturally and anchored to the ground reliably; when replacing the spool, ensure that the rigging, the control circuit is connected reliably.

6.1.6 Guide rope connection

6.1.6.1 After the helicopter flies to the joint position with a new one-axis guide rope, its rope should be dropped with a heavy object, and should be compatible with the previous one-axis rope.

Rely on connection.

6.1.6.2 The helicopter can continue to operate after the rope end of the front axle is loosened.

6.1.7 Anchorage of remaining lead rope

After the guide rope exhibition is completed and the last base tower is placed, if there is still a remaining line on the spool, the helicopter should continue to fly and release the remaining line.

Only after the tail end of the guide rope is reliably anchored to the ground can it return.

6.1.8 Unfolding multiple guide ropes

If multiple guide ropes need to be unfolded, the unfolded guide rope should be moved to the stringing tackle first, and then the next guide rope should be unfolded.

6.2 Pull and release method operation

6.2.1 Tension field layout

6.2.1.1 Before unfolding, the guide ropes of each axis should be pre-tightened and wound tightly and orderly. Displacement and cross winding are strictly prohibited.

6.2.1.2 The rope end shall be reliably anchored to the ground after extending a certain distance in the line-out direction through the tension machine and the line-pressing pulley.

6.2.2 Guide rope deployment

6.2.2.1 In the process of pulling the guide rope, the tension of the guide rope should be controlled to keep the guide rope in the air.

6.2.2.2 The cruise speed of the helicopter should match the pay-off speed of the tension machine, generally not greater than 15 km/h.

6.2.3 Guide rope into the tackle

6.2.3.1 When the helicopter flies over the tower, the speed should be reduced, maintain a stable flight attitude, put the guide rope into the guide rod of the tackle, and confirm the guide rope After sliding into the middle wheel of the pulley, you can continue to fly forward.

6.2.3.2 The constructors on the tower should fasten their safety belts. When the helicopter flies over the top of the tower, the constructors should be in a safe position inside the tower and observe the situation of the guide rope entering the pulley shall be notified in time.

6.2.3.3 The construction personnel of the tension field shall always pay attention to the deployment of the guide rope, and report in time when unsafe incidents such as job-hopping or overspeed are found.

6.2.4 Guide rope anchoring

After the last base tower of the exhibition section, the ground construction personnel should cooperate with the helicopter to reliably anchor the tail end of the guide rope to the ground.

6.3 Security

6.3.1 Security measures

6.3.1.1 All stressed tools and appliances shall be inspected as required before construction, and shall be inspected before each use.

6.3.1.2 When the helicopter flies over the straddle frame, the flight path shall be maintained to avoid the guide rope deviating from the protection range of the straddle frame.

6.3.1.3 Communication should be fast and reliable during construction. Communication language should be short, clear and clear.

6.3.2 Emergency safety measures

6.3.2.1 In the event of a situation that endangers flight safety or needs to deviate from the operation plan, the captain shall make emergency response. When emergency procedures are taken, the helicopter should be declared in an emergency, and the emergency and the measures taken should be reported to the ground commander in time.

6.3.2.2 According to the nature of the failure, flight conditions and time available for handling, the captain shall be allowed to deviate from the prescribed operating procedures and methods, depending on the situation.

The minimum weather standards and regulations stipulate, but the principle should be in accordance with the emergency response needs.

6.3.2.3 The captain has the final decision right to take emergency procedures and ensure flight safety. All crew members should follow the command of the captain.

Try to assist the captain. The captain should also listen to the opinions of other crew members and take the safest measures as far as possible depending on the situation.

6.3.2.4 After an emergency occurs, the on-site personnel should initiate emergency handling procedures.

6.3.2.5 If the weather in the operation area changes suddenly and falls below the minimum meteorological standard, the operation should be terminated.

6.3.2.6 In the following situations, the helicopter should drop the guide rope.

- When you stray into a local dangerous weather zone, your vision is blocked, and you lose contact with the ground;

--When the guide rope is stuck during the flight operation, the force on the helicopter exceeds the allowable load, and the helicopter flight attitude cannot be controlled;

--When the helicopter fails to make an emergency landing with external hanging.

When the above situation occurs, electric or mechanical throwing can be used, and should avoid people or densely constructed areas, try to throw into the emergency throwing area area.