508x75mm Sheave Helicopter Stringing Block with Reinforced Steel Frame and Corrosion Resistant Coating for Aerial Conductor Deployment

Helicopter Stringing Block for Aerial Conductor and Pilot Line Deployment

Flying a pilot line across a river, canyon or forest removes the need for ground access that may not exist. This helicopter block hangs from the cargo hook, pays the line out under control and keeps swing to a minimum so the aircraft can move from tower to tower without the line fouling.

Product Overview

The frame is reinforced around the lifting eye and the sheave axle, because helicopter work adds dynamic loads that ground stringing does not produce. Sheaves are available from 508x75mm up to 916x110mm in single, three and five sheave versions, so the same design family covers pilot line work and full conductor deployment.

Helicopter stringing block models

Dimensions and ratings are nominal. Confirm the exact model against the datasheet before ordering.

Design Features and Field Benefits

• Built for Dynamic Flight Loads: The lifting eye, axle and frame are reinforced for the shock and swing loads that occur when a helicopter starts and stops a pull, giving a margin that ground rated blocks do not have.
• Covers Pilot Line to Full Conductor: Sheave sizes from 508mm to 916mm let the same block family handle a light pilot line and then the full conductor, simplifying fleet planning.
• Deploys Over Terrain With No Ground Access: Rivers, canyons, protected wetlands and dense forest can be crossed without building access roads or clearing a right of way for vehicles.
• Reduces Line Damage During Deployment: Smooth sheave grooves and controlled payout prevent the line from dragging on rock or vegetation, which is a common source of surface damage in ground based pulls.

Selection Guidance

• Match sheave size to the line being deployed and to the aircraft's payload limit.
• Review the dynamic load case with the helicopter operator before the flight.
• Inspect the lifting eye and axle for cracks after any hard landing or snag.

Typical Applications

• Pilot line deployment over rivers and canyons
• Transmission line construction in remote terrain
• Emergency restoration after storm damage
• Crossing protected environmental areas

Quality Control and Delivery

Units are assembled in an ISO 9001 certified workshop. Frames are checked for sheave alignment and axle straightness, load bearing parts are inspected before assembly, and finished units are function checked before packing. Export packing is a plywood case with a moisture barrier, and a 12 month warranty covers manufacturing defects. Inspection records and, on request, third party load test certificates can be supplied with the shipment.

Frequently Asked Questions

For project specific configurations, drawings or inspection requirements, send the conductor size, rated load and destination port with your enquiry.