# US 12,179,926 B2 · Methods and systems for decontaminating aircraft cabins and providing indications for safe reentry > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,179,926 B2 - Document ID: US12179926B2 - Status: Granted - Kind: B2 - Application number: 17/349,224 - Filed: 2021-06-16 - Published: 2021-12-23 - Granted: 2024-12-31 - Earliest claimed: 2020-06-19 - Assignees: The Boeing Company - Applicants: The Boeing Company - Inventors: Stephen M. Trent; David R. Space; Stephanie K. Licht - Web page: https://patentgrep.com/patent/US12179926B2 ## CPC - B64D 13/08: the air being heated or cooled - B64D 13/06: the air being conditioned (pressurising B64D13/02) - B64F 5/30: Cleaning aircraft - B60H 3/0071: {Electrically conditioning the air, e.g. by ionizing} - B64D 2013/0651: {comprising filters, e.g. dust filters} - B64D 2013/0688: {with means for recirculating cabin air} - F24F 2110/65: Concentration of specific substances or contaminants - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT - B64F: GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) ## Abstract Described herein are methods and systems for decontaminating aircraft cabins and providing an indication to provide confidence that the cabins are safe for reentry post-operation. These methods and systems are based on reducing concentrations of infectious agents inside a cabin utilizing outside air and/or filtered air. In some examples, a method is performed after a certain contamination event (e.g., a sick person present on a flight and/or as a part of periodic service (e.g., in between flights. The amount of time the system is run to introduce compounds into the cabin is specifically calculated to lower the fraction of the remaining infectious agents below a certain desired level, thereby reducing the contamination concentration in the cabin from the initial concentration. The decontamination duration depends on the cabin volume and the incoming airflow rates. For example, the fraction of the remaining is brought below 5% after 9 minutes of flowing incoming air at 20 air changes per hour. ## Claims ### Claim 1 A system for decontaminating a cabin of an aircraft and providing an indication that the cabin is safe for reentry, the system comprising: a controller; at least one air conditioning pack configured to receive ambient air from outside the aircraft and to supply the ambient air into the cabin of the aircraft; at least one filter; at least one fan, configured to receive cabin air from the cabin of the aircraft, to pass the cabin air through the at least one filter thereby generating filtered air, and to supply the filtered air into the cabin; wherein the controller is communicatively coupled to the at least one air conditioning pack and to the at least one fan; wherein the controller is configured a) to receive a decontamination request and b) to determine operating parameters of the at least one air conditioning pack and the at least one fan to perform the requested decontamination, wherein the controller includes operating parameters that comprise duration of operating the at least one air conditioning pack and the at least one fan; and wherein the duration of operating the at least one air conditioning pack and the at least one fan is determined by the controller based on (a) a cabin volume of the aircraft, (b) a combined ventilation rate provided by the at least one air conditioning pack and the at least one fan, and (c) an acceptable fraction of remaining contaminated air in the aircraft; and an indicator, communicatively coupled to the controller and configured to receive a completion indication from the controller, and wherein the controller communicates the completion indication to the indicator to indicate that the cabin is safe for reentry. ### Claim 2 (depends on 1) The system of claim 1, further comprising an input device, communicatively coupled to the controller and configured to send a decontamination request to the controller, wherein the input device is one of a flight deck switch or an attendant panel. ### Claim 3 (depends on 1) The system of claim 1, further comprising one or more biosensors, positioned within the cabin of the aircraft, communicatively coupled to the controller, and configured to provide contamination concentration input to the controller. ### Claim 4 (depends on 3) The system of claim 3, wherein the controller is configured to use the contamination concentration input to trigger operation of the at least one air conditioning pack and the at least one fan. ### Claim 5 (depends on 3) The system claim 3, wherein the controller is configured to use the contamination concentration input to revise the operating parameters of the at least one air conditioning pack and the at least one fan. ### Claim 6 (depends on 1) The system of claim 1, wherein the operating parameters further comprise an operating output of each of the at least one air conditioning pack and the at least one fan. ### Claim 7 (depends on 1) The system of claim 1, further comprising one or more door sensors, positioned at each cabin door, communicatively coupled to the controller, and configured to provide door closure input, corresponding to an open-door position of each cabin door, to the controller. ### Claim 8 (depends on 7) The system of claim 7, wherein the controller is configured to operate the at least one air conditioning pack and the at least one fan based on the door closure input. ### Claim 9 (depends on 7) The system of claim 7, wherein the operating parameters of the at least one air conditioning pack and the at least one fan are further determined based on the door closure input. ### Claim 10 (depends on 1) The system claim 1, wherein the indicator is located on the outside of the aircraft, and is visible to persons outside of the aircraft. ### Claim 11 (depends on 1) The system of claim 1, wherein the indicator is located on one or more of a jet bridge, a jet bay, or an airport gate, and is visible to persons outside of the aircraft. ### Claim 12 (depends on 1) The system of claim 1, wherein the indicator comprises a wireless transmitter. ### Claim 13 A method of decontaminating a cabin of an aircraft and providing an indication that the cabin is safe for reentry, the method comprising: providing a controller; providing at least one air conditioning pack configured to receive ambient air from outside the aircraft and to supply the ambient air into the cabin of the aircraft; providing at least one filter; providing at least one fan, configured to receive cabin air from the cabin of the aircraft, to pass the cabin air through the at least one filter thereby generating filtered air, and to supply the filtered air into the cabin; communicatively coupling the controller to the at least one air conditioning pack and to the at least one fan; configuring the controller a) to receive a decontamination request and b) to determine operating parameters of the at least one air conditioning pack and the at least one fan to perform the requested decontamination, providing the controller with operating parameters that comprise duration of operating the at least one air conditioning pack and the at least one fan; and configuring the duration of operating the at least one air conditioning pack and the at least one fan to be determined by the controller based on (a) a cabin volume of the aircraft, (b) a combined ventilation rate provided by the at least one air conditioning pack and the at least one fan, and (c) an acceptable fraction of remaining contaminated air in the aircraft; and providing an indicator, and communicatively coupling the indicator to the controller and configuring the indicator to receive a completion indication from the controller, and causing the controller to communicate the completion indication to the indicator to indicate that the cabin is safe for reentry. ### Claim 14 (depends on 13) The method of claim 13, wherein the decontamination request is received from at least one biosensor positioned within the cabin. ### Claim 15 (depends on 13) The method of claim 13, wherein the decontamination request is received from an input device, communicatively coupled to the controller, and wherein the input device is one of a flight deck switch or an attendant panel. ### Claim 16 (depends on 13) The method of claim 13, wherein the decontamination request comprises a contaminant concentration input that exceeds a set threshold. ### Claim 17 (depends on 13) The method of claim 13, wherein the completion indicator is located on the outside of the aircraft and visible to persons outside of the aircraft. ### Claim 18 (depends on 13) The method of claim 13, further comprising receiving, at the controller and from one or more door sensors, a door closure input, corresponding to an open-close position of each cabin door. ### Claim 19 (depends on 18) The method of claim 18, wherein operating the at least one air conditioning pack and the at least one fan is initiated based on the door closure input. ### Claim 20 A method of decontaminating a cabin of an aircraft and providing an indication that the cabin is safe for reentry, the method comprising: providing a controller; providing at least one air conditioning pack configured to receive ambient air from outside the aircraft and to supply the ambient air into the cabin of the aircraft; providing at least one filter; providing at least one fan, configured to receive cabin air from the cabin of the aircraft, to pass the cabin air through the at least one filter thereby generating filtered air, and to supply the filtered air into the cabin; communicatively coupling the controller to the at least one air conditioning pack and to the at least one fan; configuring the controller a) to receive a decontamination request and b) to determine operating parameters of the at least one air conditioning pack and the at least one fan to perform the requested decontamination, providing the controller with operating parameters that comprise duration of operating the at least one air conditioning pack and the at least one fan; and configuring the duration of operating the at least one air conditioning pack and the at least one fan to be determined by the controller based on (a) a cabin volume of the aircraft, (b) a combined ventilation rate provided by the at least one air conditioning pack and the at least one fan, and (c) an acceptable fraction of remaining contaminated air in the aircraft; and providing an indicator, and communicatively coupling the indicator to the controller and configuring the indicator to receive a completion indication from the controller, causing the controller to communicate the completion indication to the indicator to indicate that the cabin is safe for reentry; and wherein at least one biosensor continuously monitors concentration of contaminants during the requested decontamination.