sec.243ALongwall return airway generally

### sec.243A Longwall return airway generally This section applies— in relation to a longwall return airway; and in addition to the requirements under section 243 . At least 1 automatic methane detector must be located— in the longwall return airway; and within 150m outbye of the corner of the tailgate block side rib line and the longwall coal face; and so as to measure the general body concentration of methane in the longwall return airway from— the longwall face; and the goaf. The detector must automatically— activate a visible alarm when the general body concentration of methane detected in the return air exceeds the percentage stated in the mine’s principal hazard management plan for ventilation as the percentage that must not be exceeded before the detector activates the alarm; and trip the electricity supply to the following equipment when the general body concentration of methane detected in the return air exceeds 2%— the armoured face conveyor; the longwall shearer cutters; the longwall equipment in the longwall return airway. s 243A ins 2019 SL No. 250 s 10 amd 2020 SL No. 118 s 8 (sec.243A-ssec.1) This section applies— in relation to a longwall return airway; and in addition to the requirements under section 243 . (sec.243A-ssec.2) At least 1 automatic methane detector must be located— in the longwall return airway; and within 150m outbye of the corner of the tailgate block side rib line and the longwall coal face; and so as to measure the general body concentration of methane in the longwall return airway from— the longwall face; and the goaf. (sec.243A-ssec.3) The detector must automatically— activate a visible alarm when the general body concentration of methane detected in the return air exceeds the percentage stated in the mine’s principal hazard management plan for ventilation as the percentage that must not be exceeded before the detector activates the alarm; and trip the electricity supply to the following equipment when the general body concentration of methane detected in the return air exceeds 2%— the armoured face conveyor; the longwall shearer cutters; the longwall equipment in the longwall return airway. - (a) in relation to a longwall return airway; and - (b) in addition to the requirements under section 243 . - (a) in the longwall return airway; and - (b) within 150m outbye of the corner of the tailgate block side rib line and the longwall coal face; and - (c) so as to measure the general body concentration of methane in the longwall return airway from— (i) the longwall face; and (ii) the goaf. - (i) the longwall face; and - (ii) the goaf. - (i) the longwall face; and - (ii) the goaf. - (a) activate a visible alarm when the general body concentration of methane detected in the return air exceeds the percentage stated in the mine’s principal hazard management plan for ventilation as the percentage that must not be exceeded before the detector activates the alarm; and - (b) trip the electricity supply to the following equipment when the general body concentration of methane detected in the return air exceeds 2%— (i) the armoured face conveyor; (ii) the longwall shearer cutters; (iii) the longwall equipment in the longwall return airway. - (i) the armoured face conveyor; - (ii) the longwall shearer cutters; - (iii) the longwall equipment in the longwall return airway. - (i) the armoured face conveyor; - (ii) the longwall shearer cutters; - (iii) the longwall equipment in the longwall return airway.