Iranian Classification Society Rules

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Section 2 Electric Equipment

202. Emergency electrical equipment

1. In application to 202, 2 (1) of the Rules, for category A craft not engaged on international voy- ages, it shall alternatively be applied for the following services and supplying period.

(1) For a period of 3 hours

(A) Emergency lighting at embarkation into lifeboat, etc.

(B) Emergency lighting system

(C) Ships light

(D Fire detection and alarm system

(2) For a period of 30 minutes

(A) Whistle

(B) General alarm system

(C) Radio facilities

203. Stabilization system of craft


1. In application to 203. of the Rules, for stabilization system of craft (hereinafter refer to as "stabilization system") it shall be complied with as following requirements,

Pt 6 Electrical Equipment and Control Systems

Ch 1 Electrical Equipment Pt 6, Ch 1


(1) Definition

(A) "Stabilization control system" is a system intended to stabilize the main parameters of the crafts attitude : heel, trim, course and height and control the craft's motions : roll, pitch, yaw and heave. This term excludes devices not associated with the safe operation of the craft, e.g. motion reduction or ride control systems in order to improve a great convenience. The main elements of a stabilization control system may include the following.

(a) devices such as rudders, foils, flaps, skirts, fans, water jets, tilting and steerable pro- pellers, pumps for moving fluid, etc.

(b) power drives actuating stabilization devices ; and


stabilization equipment for accumulating and processing data for making decisions and giving commands such as sensors, logic processors and automatic safety control.

(B) "Self-stabilization" is stabilization ensured solely by the craft's inherent characteristics.

(C) "Forced stabilization" is stabilization achieved by


an automatic control system ; or

(b) a manually control assisted system ; or


a combined system incorporating elements of both automatic and manually assisted con- trol systems

(D) "Augmented stabilization" is a combined of self-stabilization and forced stabilization.

(E) "Stabilization device" means a device as given in (A) (a) with the aid of which forces for controlling the craft's position are generated.

(F) "Automatic safety control" is a logic unit for processing data and making decisions to

put the craft into the displacement or other safe mode if a condition impairing safety arises.

(2) Lateral and height control systems

(A) Craft with an automatic control system should be provided with an automatic safety control plan Probable malfunctions should have only minor effects on automatic control system op-

eration and should be capable of being readily counteracted by the operating crew.

(B) The parameters and levels at which any automatic control system gives the command to de- crease speed and put the craft safety into the displacement or other safe mode should take

account of the safety level and of the safe values of motions appropriate to the particular

craft and service.

(3) Performance verification

(A) The limits of safe use of any of the stabilization control system devices should be based on demonstration and verification process in accordance with HSC Code 16.4.1

(B) Demonstration in accordance with HSC Code 16.4.1 should determine any adverse effects upon safe operation of the craft in the event of an uncontrollable total deflection of any

one control device. Any limitation on the operation of the craft as may be necessary to en-

sure that the redundancy or safeguards in the systems provide equivalent safety should be included in the craft operating manual.

2. In application applied. image

to 203, 1 of the Rules, a ship not engaged on international voyages shall be not

58 Guidance Relating to the Rules for the Classification of High Speed and Light Crafts 2015

Pt 6 Electrical Equipment and Control Systems

Ch 2 Control Systems Pt 6, Ch 2