# US 8,571,726 B2 · Method for reducing outside air inflow required for aircraft cabin air quality > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,571,726 B2 - Document ID: US8571726B2 - Status: Granted - Kind: B2 - Application number: 12/853,287 - Filed: 2010-08-09 - Published: 2011-02-24 - Granted: 2013-10-29 - Earliest claimed: 2006-12-13 - Assignees: The Boeing Company - Applicants: John C. Gray; Kyle D. Eilers; Warren A. Atkey - Inventors: John C. Gray; Kyle D. Eilers; Warren A. Atkey - Web page: https://patentgrep.com/patent/US8571726B2 ## CPC - B64D 13/04: Automatic control of pressure - Y02T 50/50: On board measures aiming to increase energy efficiency - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for calculating an aircraft fuselage leakage calculation of an aircraft is provided. The method comprises determining a calculation period for an aircraft fuselage leakage value and inputting the calculation period into a computer to obtain a first input data. The method further comprises obtaining one or more outside air inflow rates and inputting the one or more outside air inflow rates into the computer to obtain a second input data. The method further comprises obtaining one or more air outflow rates and inputting the one or more air outflow rates into the computer to obtain a third input data. The method further comprises accumulating the first input data, the second input data, and the third input data in the computer to obtain an accumulated input data. The method further comprises processing the accumulated input data with a process software to obtain an output data in the form of a calculated aircraft fuselage leakage value. The method further comprises sending the output data to a data file. The method further comprises using the calculated aircraft fuselage leakage value to calculate an aircraft fuel savings potential value. ## Claims ### Claim 1 A method for calculating an aircraft fuselage leakage calculation of an aircraft, the method comprising: determining a calculation period for an aircraft fuselage leakage value and inputting the calculation period into a computer to obtain a first input data; obtaining one or more outside air inflow rates and inputting the one or more outside air inflow rates into the computer to obtain a second input data; obtaining one or more air outflow rates and inputting the one or more air outflow rates into the computer to obtain a third input data; accumulating the first input data, the second input data, and the third input data in the computer to obtain an accumulated input data; processing the accumulated input data with a process software to obtain an output data in the form of a calculated aircraft fuselage leakage value; sending the output data to a data file; and, using the calculated aircraft fuselage leakage value to calculate an aircraft fuel savings potential value, wherein the method communicates the aircraft fuselage leakage value and an increase in a fuel consumption rate due to an additional amount of outside air inflow required to replenish air loss due to fuselage leakage, due to aerodynamic drag, and due to reduced thrust recovery. ### Claim 2 (depends on 1) The method of claim 1, further comprising communicating the aircraft fuel savings potential value to an aircraft operator. ### Claim 3 (depends on 1) The method of claim 1, wherein the calculation period is selected from the group comprising one of a continuous period, each flight of the aircraft, and a regular interval of days. ### Claim 4 (depends on 1) The method of claim 1, wherein the one or more outside air inflow rates comprises an air conditioning pack outside air inflow rate. ### Claim 5 (depends on 1) The method of claim 1, wherein the one or more air outflow rates comprises a nitrogen generation system outflow rate. ### Claim 6 (depends on 1) The method of claim 1, wherein the process software comprises a ground based software that is part of a ground data processing station. ### Claim 7 (depends on 1) The method of claim 1, wherein the process software comprises an in-flight software that stores the input data on the aircraft for subsequent download to a ground based data processing station. ### Claim 8 (depends on 1) The method of claim 1, wherein the method reduces fuel consumption related to energy consumed by a compressed air source on the aircraft. ### Claim 9 A method for calculating an aircraft fuselage leakage calculation of an aircraft, the method comprising: determining a calculation period for an aircraft fuselage leakage value and inputting the calculation period into a computer to obtain a first input data, the calculation period selected from the group comprising one of a continuous period, each flight of the aircraft, and a regular interval of days; obtaining an air conditioning pack outside air inflow rate from an aircraft air conditioning pack and inputting the air conditioning pack outside air inflow rate into the computer to obtain a second input data; obtaining a nitrogen generation system outflow rate from the aircraft and inputting the nitrogen generation system outflow rate into the computer to obtain a third input data; accumulating the first input data, the second input data, and the third input data in the computer to obtain an accumulated input data; processing the accumulated input data with a process software selected from the group comprising a ground based software that is part of a ground data processing station and an in-flight software that stores the input data on the aircraft for subsequent download to a ground based data processing station, in order to obtain an output data in the form of a calculated aircraft fuselage leakage value; sending the output data to a data file; using the calculated aircraft fuselage leakage value to calculate an aircraft fuel savings potential value; and, communicating the aircraft fuel savings potential value to an aircraft operator, wherein the method communicates the aircraft fuselage leakage value and an increase in a fuel consumption rate due to an additional amount of outside air inflow required to replenish air loss due to fuselage leakage, due to aerodynamic drag, and due to reduced thrust recovery. ### Claim 10 A system for calculating an aircraft fuselage leakage calculation of an aircraft, the system comprising: a computer having accumulated input data comprising a first input data comprising a calculation period for an aircraft fuselage leakage value, a second input data comprising one or more outside air inflow rates, and a third input data comprising one or more air outflow rates; a process software for processing the accumulated input data to obtain an output data in the form of a calculated aircraft fuselage leakage value; a data file for receiving the output data; and, wherein the calculated aircraft fuselage leakage value is used to calculate an aircraft fuel savings potential value, and further wherein the system is configured to communicate the aircraft fuselage leakage value and an increase in a fuel consumption rate due to an additional amount of outside air inflow required to replenish air loss due to fuselage leakage, due to aerodynamic drag, and due to reduced thrust recovery. ### Claim 11 (depends on 10) The system of claim 10, further comprising a communication system for communicating the aircraft fuel savings potential value to an aircraft operator. ### Claim 12 (depends on 10) The system of claim 10, wherein the calculation period is selected from the group comprising one of a continuous period, each flight of the aircraft, and a regular interval of days. ### Claim 13 (depends on 10) The system of claim 10, wherein the one or more outside air inflow rates comprises an air conditioning pack outside air inflow rate. ### Claim 14 (depends on 10) The system of claim 10, wherein the one or more air outflow rates comprises a nitrogen generation system outflow rate. ### Claim 15 (depends on 10) The system of claim 10, wherein the process software comprises a ground based software that is part of a ground data processing station. ### Claim 16 (depends on 10) The system of claim 10, wherein the process software comprises an in-flight software that stores the input data on the aircraft for subsequent download to a ground based data processing station. ### Claim 17 (depends on 10) The system of claim 10, wherein the system reduces fuel consumption related to energy consumed by a compressed air source on the aircraft. ### Claim 18 (depends on 10) The system of claim 10, wherein the one or more outside air inflow rates and the one or more air outflow rates are measured on a mass flow basis or volumetric flow basis.