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

- Automatic deployable ELT (ELT(AD)). An ELT which is rigidly attached to anaircraft and which is automatically deployed and activated by impact, and in somecases, also by hydrostatic sensors. Manual deployment is also provided.- Survival ELT (ELT(S)). An ELT which is removable from an aircraft, stowedso as to facilitate its ready use in an emergency, and manually activated bysurvivors.NOTE: ELT(AF), ELT(AP) and ELT(AD) shall have means to detect the occurrence of a crash,automatically activate the transmitter and radiate a signal through an antenna. In the case ofELT(AD), the equipment shall have provision for manual deployment before a crash, andautomatic deployment during a crash. Refer EUROCAE standard ED-62 'MinimumOperational performance Specification for Aircraft ELT' for details.An Automatic ELT is either an ELT(AF), ELT(AP) or ELT(AD).Extended flight over water. A flight over a route on which the aeroplane may beover water away from land suitable for making an emergency landing at a distance of:(a)(b)more than 185 km (100 NM), in the case of single-engined aeroplanes, andmore than 370 km (200 NM), in the case of multi-engined aeroplanes capableof continuing flight with one engine inoperative.Long-range over-water flight A flight over a route on which the aeroplane maybe over water and at more than a distance corresponding to:(a)120 minutes at cruising speed or 740 km (400 NM), whichever is the lesser,away from land suitable for making an emergency landing in the case ofaircraft operated in accordance with:(i) En route – one power-unit inoperative. The aeroplane shall be able,in the event of the critical power-unit becoming inoperative at anypoint along the route or planned diversions therefrom, to continue theflight to an aerodrome without flying below the minimum flightaltitude at any point, or(ii)En route – two power-units inoperative. In the case of aeroplaneshaving three or more power-units, on any part of a route where thelocation of en-route alternate aerodrome and the total duration of theflight are such that the probability of a second power-unit becominginoperative must be allowed for if the general level of safety is to bemaintained, the aeroplane shall be able, in the event of any two powerunitsbecoming inoperative, to continue the flight to an en-routealternate aerodrome and land.(b)30 minutes or 185 km (100 NM), whichever is the lesser, for all otheraeroplanes.31 January 2007 AN-27 P.2