4.4 Accommodation design

4.4.1 The public spaces and crew accommodation of high speed craft should be located and designed to protect passengers and crew under the collision design condition. In this respect, these spaces should not be located within a distance of:

of the extreme forward end of the top of the effective hull girder of the craft, where the terms V and g_coll are as defined in 4.3.3. For this purpose g_collneed not be taken as less than 3, and should not be taken as greater than 12.

4.4.2 The accommodation should be designed according to the guidelines given in table 4.4.2 and to performance requirements given in annex 9, or by other methods which have been proven to give equal protective qualities.

Table 4.4.2 Overview gerneral design guidelines

Design Level 1: g_coll less than 3
1	Seat/seat belts
1.1	Low or high seatback
1.2	No restrictions on seating
1.3	Sofas allowed
1.4	No seat belts requirement
2	Tables in general allowed
3	Padding of projecting objects
4	Kiosks, bars, etc., no special restrictions
5	Baggage, no special requirements
6	large masses, restrainment
Design level 2: g_coll 3 to 12
1	Seat/seat belts
1.1	High seatback with protective deformation and padding
1.2	Forward or backward seating direction
1.3	No sofas allowed as seat
1.4	Lap belt in seats when no protective structure forward
2	Tables with protective features allowed. Dynamic testing
3	Padding of projecting objects
4	Kiosk , bars , etc., on aft side of bulkheads, or other specially approved arrangments
5	Baggage placed with protection forward
6	Large masses, restrainment and positioning
Design Level 3: g_coll above 13
1	Seat/seat belts
1.1	High seatback with protective deformation and padding
1.2	Forward or backward seating direction
1.3	No sofas allowed as seat
1.4	Seat belt necessary to obtain required protection
—	No belts in backwards facing seats
—	3 point belt or belt with shoulder harness in forward facing seats
2	No tables allowed
3	Padding of protecting objects, specially approved
4	Kiosk, bars, etc ., specially approved
5	Baggage placedwith protection forward, specially approved
6	Large masses restrainment and positioning, speacially approved
*	Other arrangements may be employed if an equivalent level safety is acheived

4.4.3 Equipment and baggage in public spaces and in the operator's compartment should be positioned and secured so that they remain in the stowed position when exposed to the collision design acceleration according to 4.3.3 and 4.3.4.

4.4.4 Mountings of large masses such as main engines, auxiliary engines, lift fans, transmissions and electrical equipment should be proved by calculations to withstand the collision design acceleration according to 4.3.3 and 4.3.4 without fracturing.

4.4.5 Seats, life-saving appliances and items of substantial mass and their supporting structure should not deform or dislodge under any loads up to those specified in 4.3.3 and 4.3.4 in any manner that would impede subsequent rapid evacuation of passengers.

4.4.6 There should be adequate handholds on both sides of any passage to enable passengers to steady themselves while moving about.