US 7,573,396 B2
Air craft emergency lighting system
Peter David Stokes, North Elmham (United Kingdom)
Assigned to SAF-T-GLO Limited, Norfolk (United Kingdom)
Appl. No. 11/663,405
PCT Filed Sep. 21, 2005, PCT No. PCT/GB2005/003639
§ 371(c)(1), (2), (4) Date Mar. 21, 2007,
PCT Pub. No. WO2006/032883, PCT Pub. Date Mar. 30, 2006.
Claims priority of application No. 0420884.9 (GB), filed on Sep. 21, 2004; application No. 0500528.5 (GB), filed on Jan. 12, 2005; and application No. 0509266.3 (GB), filed on May 06, 2005.
Prior Publication US 2008/0101078 A1, May 01, 2008
Int. Cl. G08B 23/00 (2006.01); G08B 1/00 (2006.01); B64D 47/02 (2006.01)
U.S. Cl. 340—693.2  [340/514; 340/945; 340/636.1; 340/691.1; 340/693.1; 340/332; 340/333; 307/64; 307/10.8; 315/86; 362/470; 362/471] 21 Claims
OG exemplary drawing
 
1. An aircraft emergency lighting system comprising a plurality of units having communication devices arranged to communicate wirelessly with a master controller wherein each unit is wired to a common power supply for powering the unit in a first mode of operation and has its own back-up battery power supply for powering the unit in a second mode of operation, and wherein means is provided for off-load testing the back-up battery power supply of each unit and indicating if the unit is operational.