31 July 2011 C1 CIVIL AVIATION DEPARTMENT HONG KONG ...

NOTE: 'Designated' emergency exits are the minimum required for the certificatedpassenger capacity. 'Excess' emergency exits are additional exits to theminimum required which satisfy the same arrangement, marking andlighting requirements as for 'designated' exits and which are also readilyaccessible.2.6.2 The exit should be positively identifiable to enable a passenger toproceed to it without hesitation in conditions where the exit is eitheropen or closed. All exits likely to be available for use in anemergency should, therefore, have exit identifiers.2.6.3 Exit identifiers of floor level exits need to be located so that they can beseen directly when adjacent to the last aisle marker, or in the case of aflood-lit system, within the flood-lit zone, and viewed on the verticalcentre line of the aisle at a height no more than 4 feet above the cabinfloor level. Additional cues to a passenger may, however, beprovided as an alternative such as horizontally mounted exit identifierslocated on an aft or forward bulkhead in the vestibule leading to an exitand within direct line of sight of a passenger when approaching thevestibules from the aisle.2.6.4 Exit identifiers should, wherever practicable, be located at such adistance from the floor that they will not be obscured by any strewnhand baggage likely to be present in an emergency evacuation. It is,therefore, recommended that exit identifiers be located between 18inches and 4 feet above the cabin floor level.2.6.5 Where exit identifiers are mounted on cabin sidewalls and located closeto passenger seats, they should be visible from the aisle with the seatnext to the identifier occupied. This takes account of a passengerseated next to an exit being incapacitated. (A passenger slumpedforward or sideways should also be considered.)2.7 Escape Path Marking along Cabin Aisle Floor2.7.1 Where single point incandescent type or electro-luminescent strip typefloor track markers are employed, the Director-General recommends adistance between markers no greater than 20 inches (thus permitting amaximum distance between markers of 40 inches under typicalMinimum Equipment List (MEL) conditions).NOTE: Where incandescent lights are installed on the side of seats the distancebetween lights should not exceed 40 inches.2.7.2 Where photo-luminescent strips are installed, they must be placed inlocations where they are capable of receiving suitable illumination frominternal sources of cabin lighting and where they would not be coveredup by any cabin fittings for any significant time which would adverselyaffect their operation. They must be kept clean to allow maximum light31 January 2002 AN-56 P.2