This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage and manufacturer's warranty of grounding strip lights. This standard applies to flat touchdown strip lights on Category I or Category I precision approach runways in civil airports. Touchdown zone lights use light signals to provide aircraft on approach and landing with information on the location of the touchdown zone on the runway in poor visibility conditions.
QB/T 3744-1999 history
2012QB/T 4438-2012 Touchdown zone lights for civil airport
1988QB/T 3744-1999 Technical requirements for touchdown zone lights
QB/T 3744-1999 Technical requirements for touchdown zone lights was changed to QB/T 4438-2012 Touchdown zone lights for civil airport.