5.0 Helicopter Tie-Down Points

5.1 Sufficient flush fitting (when not in use) or removable semi-recessed tie-down points should be provided for securing the maximum sized helicopter for which the helicopter landing area is designed. They should be so located and be of such strength and construction to secure the helicopter when subjected to expected weather conditions. They should also take into account the inertial forces resulting from the movement of the vessel.

5.2 Tie-down rings should be compatible with the dimensions of tie-down strop attachments. Tie-down rings and strops should be of such strength and construction so as to secure the helicopter when subjected to expected weather conditions. The maximum bar diameter of the tie-down ring should be compatible with the strop hook dimension of the tie down strops carried by the helicopter operator.

An example of a suitable tie-down configuration is shown at Figure 3. The Aviation Inspection Body or helicopter operator will provide guidance on the configuration of the tie-down points for specific helicopter types.

Figure 3 Example of Suitable Tie-down Configuration

NOTES:

1 The tie-down configuration should be based on the centre of the Aiming Circle marking.

2 Additional tie-downs will be required in a parking area.

3 The outer circle is not required for 'D' values of less than 22.2m.