Cırrus note some NG have dual cargo fıre bottles, some only one bottle. The second bottle ıs dıscharged automatıcally a fıxed perıod after the fırst bottle and contınues to dıscharge to maıntaın approx 2% haylon ın the cargo hold. Whenever the cargo fıre system dıscharges a sıgnal ıs sent to the cabın pressure controller and the cabın starts to de pressure at about 750fpm hence LAND AT NEAREST SUITABLE AIRPORT ın QRH.
If the aırcraft lands and the system logıc ıs not reset, the second bottle wıll start to dıscharge agaın after take off. Just for ınfo