An aircraft shall be equipped with approved portable fire extinguishers, the required number of which shall be installed in compliance with Attachment 21. The fire extinguishing agents contained in the fire extinguisher shall not generate toxic gas in the aircraft when discharged.For the aircraft which the certificate of airworthiness is first issued on or after 31st of December 2011, halon-emitting fire extinguishers shall not be installed in its lavatory.For the aircraft which the certificate of airworthiness is first issued on or after 31st of December 2016, halon-emitting portable fire extinguishers shall not be installed.If any aircraft described in the preceding paragraph, due to special circumstances, is unable to meet the compliance date of Halon alternatives that prescribed in the previous paragraph of this article, the operator shall submit an application to CAA for its discretion for release of such due date requirement. Along with its application, the operator shall expressly provide clear description of ground for application and the relevant information, if deemed applicable.ATTACHMENT 21 Numbers of Portable Fire Extinguishers Required in General Aviation Aircraft.pdf