Section 1 General

1.1.1 The requirements contained in these Rules apply to naval ships of all rudder and propulsion types, where the length between perpendiculars, L _pp, is 50 m and over. Special consideration may be given to applying these requirements to smaller vessels.

1.1.2 These requirements, which are optional, establish a ship’s manoeuvring capability by assessing its characteristics in conjunction with engine and propulsion performance. Such requirements are additional to those applicable in the Rules and Regulations for the Classification of Naval Ships (hereinafter referred to as the Rules for Naval Ships) contained in Vol 1 Ship Structures and Vol 2 Machinery and Engineering Systems.

1.1.3 Where a ship’s manoeuvring capability is assessed and verified in accordance with these Rules, it will be eligible for the class notations specified in Vol 3, Pt 1, Ch 4, 1.2 Class notations.

1.1.4 For a ship under construction, the requirements of Vol 3, Pt 1, Ch 4, 2 Assessment for LMA notation or Vol 3, Pt 1, Ch 4, 3 Assessment for LNMA notation are to be met as applicable.

1.1.5 For an existing ship, all available data and full-scale manoeuvring information are to be submitted. This information will be examined against the requirements of these Rules and, if acceptable, the scope of the representative manoeuvres required in Vol 3, Pt 1, Ch 4, 4 Verification trials may be reduced.

1.1.6 Where the LMA notation is applied, these Rules satisfy the requirements of IMO Resolution A.601(15) – Provision and Display of Manoeuvring Information on Board Ships – (Adopted on 19 November 1987) and Resolution MSC.137(76) - Standards for Ship Manoeuvrability - (adopted on 4 December 2002) .

1.1.7 Where the LNMA notation is applied, these Rules enable LR to verify compliance with the minimum manoeuvring performance criteria defined in Vol 3, Pt 1, Ch 4, 3.3 Manoeuvring performance criteria.

1.1.8 Compliance with either of these notations will facilitate the verification of the performance requirements of ANEP-77 NATO Naval Ship Code, Chapter III, Regulation 5 – Controllability and Regulation 8 – Operator Guidance.

1.2.1 In addition to the hull and machinery class notations defined in Vol 1, Pt 1, Ch 2, 3 Character of Classification and Class notations, ships complying with these requirements will be eligible to be assigned the notations:

1.2.2 Details of any subsequent modifications to the ship’s structure or equipment resulting in any alteration to the data specified in Vol 3, Pt 1, Ch 4, 1.3 Information and Documentation required for submission are to be submitted for re-assessment of the ship's manoeuvring capability.

1.3.1 Information required for the LMA and LNMA assessment:

• Assessment & Verification Plan;
• Ship specific manoeuvring performance criteria, see Vol 3, Pt 1, Ch 4, 3.3 Manoeuvring performance criteria;
• Simulation report (if applicable);
• Model test report (if applicable).
• Details of the model test facility (if applicable);
• Trials Procedure;
• Operator Guidance (on completion).

1.4.1 In so far as these Rules are concerned, a ship will be deemed a sister ship, if that ship has been built to the same plans as the lead ship which has completed a manoeuvring assessment in accordance with the requirements of this Chapter.

1.4.2 In demonstrating that a ship is a sister ship, the hull dimensions, weights, tank capacities and arrangements, engine power and propulsion, rudder, performance and general superstructure design are to be identical.

1.4.3 The manoeuvring information for the lead ship may be used for the sister ship. All duplicate data is to be marked, ‘Data duplicated from sister ship (name of lead ship)’.

1.4.4 For a sister ship to a ship carrying the LMA notation, the ship will be required to carry out the following representative manoeuvres, in accordance with Vol 3, Pt 1, Ch 4, 4 Verification trials:

1. A ship’s stopping manoeuvre from full sea speed achieved by the application of full astern thrust.

2. A 10º/10º zig-zag manoeuvre under the approach conditions defined in Vol 3, Pt 1, Ch 4, 4.4 Approach conditions.

3. A 20º/20º zig-zag manoeuvre under the approach conditions defined in Vol 3, Pt 1, Ch 4, 4.4 Approach conditions.

4. An initial turning trial under the approach conditions defined in Vol 3, Pt 1, Ch 4, 4.4 Approach conditions.

1.4.5 For a sister ship to a ship carrying the LNMA notation the ship will be required to verify performance at sea trials. The manoeuvring performance criteria to be achieved are to be the same as those applied for the lead ship. The manoeuvres which are required to be repeated for a sister ship are shown in Table 4.1.1 Assessment phases for manoeuvring abilities.