Cargo fire-suppression agent distribution system

A cargo fire-suppression agent distribution system comprising:

• a fire detector operable to receive a fire-warning signal indicating presence of fire in a cargo compartment of an aircraft, the aircraft receiving the fire-warning signal while the aircraft is at a first altitude;
• a fire-suppression agent time determination module operable to activate an initial fire suppression agent and a re-enforcing fire-suppression agent at a first activation time and a second activation time, respectively;
• and
• a controller operable to:
• distribute the initial fire-suppression agent in the cargo compartment at the first altitude sufficient to suppress fire for an initial fire-suppression time interval, during which the aircraft enters a depressurization phase and flies to a second altitude below the first altitude;
• block distribution of any fire-suppression agent for a time interval in response to a determination that the aircraft has reached a predetermined low oxygen level sufficient to maintain fire-suppression, wherein the time interval follows the initial fire-suppression time interval;
• distribute the re-enforcing fire-suppression agent in the cargo compartment after the time interval elapses during a re-pressurization phase, when a cabin altitude is below a predetermined cabin pressure level (PL) and the aircraft descends from the second altitude to a landing;
• and
• maintain distribution of the re-enforcing fire-suppression agent during a re-enforcing fire-suppression time interval.