diff --git a/systems_design/CMakeLists.txt b/systems_design/CMakeLists.txt
index 9dff873871c8a00d2f07fd12e3204c60e1d0dd87..226e80779b18710ed25176e6a31215ed96ea7a08 100644
--- a/systems_design/CMakeLists.txt
+++ b/systems_design/CMakeLists.txt
@@ -40,7 +40,6 @@ set(MODULE_SOURCES
     src/common/aircraftSystems/conventionalATA30.cpp
     src/common/aircraftSystems/conventionalATA32.cpp
     src/common/aircraftSystems/conventionalATA33.cpp
-    src/common/aircraftSystems/conventionalATA35.cpp
     src/common/aircraftSystems/conventionalATA36.cpp
     src/common/aircraftSystems/conventionalATA49.cpp
     src/common/aircraftSystems/conventionalATA70.cpp
diff --git a/systems_design/src/common/aircraftSystems/conventionalATA35.cpp b/systems_design/src/common/aircraftSystems/conventionalATA35.cpp
deleted file mode 100644
index 2c274738984656fb256608d187cdf1ef4885fca7..0000000000000000000000000000000000000000
--- a/systems_design/src/common/aircraftSystems/conventionalATA35.cpp
+++ /dev/null
@@ -1,125 +0,0 @@
-/*
- * UNICADO - UNIversity Conceptual Aircraft Design and Optimization
- *
- * Copyright (C) 2025 UNICADO consortium
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- * Description:
- * This file is part of UNICADO.
- */
-
-#include "conventionalATA35.h"
-
-#include <runtimeInfo/runtimeInfo.h>
-
-conventionalATA35::conventionalATA35(const std::string& systemName, bool systemIsOperating, std::shared_ptr<systemsIOData> data, const RuntimeIO& rtIO)
-    :
-    aircraftSystem(systemName, systemIsOperating, data, rtIO) {
-    ATA = "ATA-35";
-    myRuntimeInfo->out << "  Create: " << Name << "  ->  " << ATA << std::endl;
-    //ctor
-}
-
-conventionalATA35::~conventionalATA35() {
-    //dtor
-}
-
-/* Reading system specific parameters of configuration xml file */
-void conventionalATA35::readParameters(const node& config) {
-    scaling_factor = EndnodeReadOnly<double>("/module_configuration_file/program_settings/scaling_factors/oxygen_system").read(config).value();
-}
-
-/* Updating system specific parameters in aircraft xml file */
-void conventionalATA35::updateXML() {
-    updateMass("oxygen_system", Mass, ATA);
-}
-
-void conventionalATA35::calculateSystemsPower(const powerProfile& allPreviousSystemsBleed,
-        const std::vector<powerProfile>& allPreviousSystemsHydraulic,
-        const std::vector<powerProfile>& allPreviousSystemsElectric,
-        const powerProfile& allPreviousSystemsHeat) {
-    /* Define unused function parameters to avoid linter warnings */
-    UNUSED(allPreviousSystemsBleed);
-    UNUSED(allPreviousSystemsHydraulic);
-    UNUSED(allPreviousSystemsElectric);
-    UNUSED(allPreviousSystemsHeat);
-    /* Calculate Systems Power */
-    initializePowerProfile();
-    if (Operating == true) {
-        getPower();
-    }
-    calculateMaxMissionPower();
-}
-void conventionalATA35::calculateSinkMass(const powerProfile& sourceBleed,
-        const std::vector<powerProfile>& sourceElectric,
-        const std::vector<powerProfile>& sourceHydraulic) {
-    /* Define unused function parameters to avoid linter warnings */
-    UNUSED(sourceBleed);
-    UNUSED(sourceElectric);
-    UNUSED(sourceHydraulic);
-    /* Calculate Systems Mass */
-    Mass = scaling_factor * getMass();
-    refPoint = getRefPoint();
-}
-void conventionalATA35::getPower() {
-    /*Loop over hydraulic circuits*/
-    for (size_t n(0); n < Hydraulic.size(); n++) {
-        Hydraulic.at(n).designPower = 0.0;
-    }
-    for (size_t n(0); n < Electric.size(); n++) {
-        Electric.at(n).designPower = 0.0;
-    }
-    bleedAir.designPower = 0.0;
-    for (size_t i = 0; i < data_->mission.Steps.size(); i++) {
-        bleedAir.missionPower.at(i).baseLoad     = 0.0;
-        heatLoad.missionPower.at(i).baseLoad     = 0.0;
-        for (size_t n(0); n < Electric.size(); n++) {
-            Electric.at(n).missionPower.at(i).baseLoad     = 0.0;
-        }
-        /*Loop over hydraulic circuits*/
-        for (size_t n(0); n < Hydraulic.size(); n++) {
-            Hydraulic.at(n).missionPower.at(i).baseLoad = 0.0;
-        }
-    }
-}
-
-double conventionalATA35::getMass() {
-    int PAX = data_->data.Accommodation.PAX;
-    int flightCrew = data_->data.Accommodation.flightCrew;
-    int cabinCrew = data_->data.Accommodation.cabinCrew;
-    int nrPAX = PAX + flightCrew + cabinCrew;
-    std::vector<double> m_ATA35;
-    /* [Ros89] (Toreenbeek Method) **/
-    if (data_->data.Performance.designRange < 6000. * 1000.) { //[m]
-        m_ATA35.push_back(13.6 + 0.544 * nrPAX);
-    } else {
-        m_ATA35.push_back(18.1 + 1.09 * nrPAX);
-    }
-//    /** [Ros89] (GD Method): m_ATA35 = 7 * (PAX+Crew)^0.702 (lb)**/
-//    m_ATA35.push_back( 7. * pow(nrPAX, 0.702) );
-//    m_ATA35.back() = m_ATA35.back() * 0.4535924; //lb -> kg
-    double massATA35(0.);
-    for (size_t i = 0; i < m_ATA35.size(); i++) {
-        massATA35 += m_ATA35.at(i);
-    }
-    massATA35 = massATA35 / static_cast<int>(m_ATA35.size());
-    return  massATA35;
-}
-
-Vec3 conventionalATA35::getRefPoint() {
-    /* Assumption: center of gravity at 45% fuselage length **/
-    double fuselage_length = geom2::measure::length(data_->theFuselage.back());
-    return Vec3(data_->theFuselage.back().origin[0] + 0.45 * fuselage_length, data_->theFuselage.back().origin[1], data_->theFuselage.back().origin[2]);
-}
diff --git a/systems_design/src/common/aircraftSystems/conventionalATA35.h b/systems_design/src/common/aircraftSystems/conventionalATA35.h
deleted file mode 100644
index 0ad7a1e305ca0b20fe8de576708fc4ed7f7aa1ab..0000000000000000000000000000000000000000
--- a/systems_design/src/common/aircraftSystems/conventionalATA35.h
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * UNICADO - UNIversity Conceptual Aircraft Design and Optimization
- *
- * Copyright (C) 2025 UNICADO consortium
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- * Description:
- * This file is part of UNICADO.
- */
-
-#ifndef SYSTEMS_DESIGN_SRC_COMMON_AIRCRAFTSYSTEMS_CONVENTIONALATA35_H_
-#define SYSTEMS_DESIGN_SRC_COMMON_AIRCRAFTSYSTEMS_CONVENTIONALATA35_H_
-
-/* The following statements import necessary libraries */
-#include <string>                                                       // Import c++ standard library for using string
-#include <vector>                                                       // Import c++ standard library for using vector
-#include <memory>                                                       // Import c++ standard library for using memory
-
-/* The following statements import necessary header files */
-#include <svl/SVL.h>                                                    // Import of header file from src folder for SVL
-#include "../aircraftSystem.h"                                          // Import of header file from src folder for aircraft system
-#include "../powerProfile.h"                                            // Import of header file from src folder for power profile
-#include "../systemsIOData.h"                                           // Import of header file from systemsIOData for accessing data_. Can't be included in
-                                                                        // aircraftSystem.h because that would lead to circular dependencies
-
-/** \class conventionalATA35
- * \brief class that contains all properties of the oxygen system (ATA35)
- */
-class conventionalATA35: public aircraftSystem {
- public:
-    /**
-     * \brief function for reading the system specific parameters from the config
-     * 
-     * \param config const node&: systemsDesign configuration file
-    */
-    void readParameters(const node& config) override;
-    /**
-     * \brief function for updating the system specific values in the aircraft xml
-    */
-    void updateXML() override;
-    void calculateSystemsPower(const powerProfile& allPreviousSystemsBleed,
-                               const std::vector<powerProfile>& allPreviousSystemsHydraulic,
-                               const std::vector<powerProfile>& allPreviousSystemsElectric,
-                               const powerProfile& allPreviousSystemsHeat) override;
-    void calculateSinkMass(const powerProfile& sourceBleed,
-                           const std::vector<powerProfile>& sourceElectric,
-                           const std::vector<powerProfile>& sourceHydraulic) override;
-
-    /** \brief  calculates the power demand of the oxygen system (ATA35)
-     * \return void
-     */
-    void getPower();
-
-    /** \brief calculates the mass of the oxygen system (ATA35)
-     * \return double massATA35: mass of the oxygen system[kg]
-     */
-    double getMass();
-
-    /** \brief calculates the reference point of the oxygen system (ATA35)
-     */
-    Vec3 getRefPoint();
-
-    /** \brief Constructor
-     * \param systemName string
-     * \param systemIsOperating bool: switch whether system is operating (1) or not(0)
-     * \param theSettings const systemsDesignSettings&
-     * \param myAircraft aircraft
-     */
-    conventionalATA35(const std::string& systemName, bool systemIsOperating, std::shared_ptr<systemsIOData> data, const RuntimeIO& rtIO);
-    virtual ~conventionalATA35();
-};
-
-#endif // SYSTEMS_DESIGN_SRC_COMMON_AIRCRAFTSYSTEMS_CONVENTIONALATA35_H_
diff --git a/systems_design/src/standard/standardReport.cpp b/systems_design/src/standard/standardReport.cpp
index 916183ba71174a9fa1fce467155b5a832a0200d5..ae31738bd2da98c191e391a1953125f3abd99ee4 100644
--- a/systems_design/src/standard/standardReport.cpp
+++ b/systems_design/src/standard/standardReport.cpp
@@ -130,12 +130,6 @@ void standardSystemsDesign::setHtmlBody() {
                                     << "</tr>" << std::endl
                                     << "<tr>" << std::endl;
                                     }
-                                    if (data_->Systems.systemExists("ATA-35")) {
-                                    report_.htmlReportStream() << std::setprecision(4) << "<td>ATA-35</td><td>Oxygen</td><td>" <<
-                                       data_->Systems.allSystems.at(data_->Systems.getSpecificSystem("ATA-35"))->Mass << " kg</td>" << std::endl
-                                    << "</tr>" << std::endl
-                                    << "<tr>" << std::endl;
-                                    }
                                     if (data_->Systems.systemExists("ATA-38")) {
                                     report_.htmlReportStream() << std::setprecision(4) << "<td>ATA-38</td><td>Water & Waste</td><td>" <<
                                        data_->Systems.allSystems.at(data_->Systems.getSpecificSystem("ATA-38"))->Mass << " kg</td>" << std::endl
@@ -247,8 +241,6 @@ void standardSystemsDesign::setTexBody() {
                                       << "& $\\kilogram$ \\\\" << std::endl
                                    << "          Lighting & ATA-33 & " << Rounding(data_->Systems.allSystems.at(data_->Systems.getSpecificSystem("ATA-33"))->Mass, 0)
                                       << "& $\\kilogram$ \\\\" << std::endl
-                                   << "          Oxygen & ATA-35 & " << Rounding(data_->Systems.allSystems.at(data_->Systems.getSpecificSystem("ATA-35"))->Mass, 0)
-                                      << "& $\\kilogram$ \\\\" << std::endl
                                    << "          Bleed Air & ATA-36 & " << Rounding(data_->Systems.allSystems.at(data_->Systems.getSpecificSystem("ATA-36"))->Mass, 0)
                                    << "& $\\kilogram$ \\\\" << std::endl
                                    << "          Auxiliary Power Unit (APU) & ATA-49 & "
diff --git a/systems_design/src/standard/standardSystemsDesign.cpp b/systems_design/src/standard/standardSystemsDesign.cpp
index 15f226a3e3b9284a75e23095a5c22b466ecb3061..91ed3498ed6aa20437b8c141ce5c0ef2ea0e5081 100644
--- a/systems_design/src/standard/standardSystemsDesign.cpp
+++ b/systems_design/src/standard/standardSystemsDesign.cpp
@@ -42,7 +42,6 @@
 #include "../common/aircraftSystems/electricATA30.h"
 #include "../common/aircraftSystems/conventionalATA32.h"
 #include "../common/aircraftSystems/conventionalATA33.h"
-#include "../common/aircraftSystems/conventionalATA35.h"
 #include "../common/aircraftSystems/conventionalATA36.h"
 #include "../common/aircraftSystems/conventionalATA49.h"
 #include "../common/aircraftSystems/conventionalATA70.h"
@@ -174,9 +173,6 @@ void standardSystemsDesign::initializeSystems() {
         } else if (data_->configuration.Sinks.at(i).systemName == "conventionalLighting") { //ATA-33
             data_->Systems.energySink.push_back(
                 new conventionalATA33(data_->configuration.Sinks.at(i).systemName, data_->configuration.Sinks.at(i).systemOperating, data_, *rtIO_));
-        } else if (data_->configuration.Sinks.at(i).systemName == "conventionalOxygenSystem") { // ATA-35
-            data_->Systems.energySink.push_back(
-                new conventionalATA35(data_->configuration.Sinks.at(i).systemName, data_->configuration.Sinks.at(i).systemOperating, data_, *rtIO_));
         } else if (data_->configuration.Sinks.at(i).systemName == "electricIceRainProtection") { //ATA-30
             data_->Systems.energySink.push_back(
                 new electricATA30(data_->configuration.Sinks.at(i).systemName, data_->configuration.Sinks.at(i).systemOperating, data_, *rtIO_));
diff --git a/systems_design/systems_design_conf.xml b/systems_design/systems_design_conf.xml
index d1a942dd840d560689845cb93afe84089ee40483..4c64428c887aba0ed1d52e2b06f11971f87715a1 100644
--- a/systems_design/systems_design_conf.xml
+++ b/systems_design/systems_design_conf.xml
@@ -112,13 +112,6 @@
 				<upper_boundary>inf</upper_boundary>
 				<default>1</default>
 			</lighting_system>
-			<oxygen_system description="Scaling factor for the oxygen system.">
-				<value>1</value>
-				<unit>1</unit>
-				<lower_boundary>0</lower_boundary>
-				<upper_boundary>inf</upper_boundary>
-				<default>1</default>
-			</oxygen_system>
 			<bleed_air_system description="Scaling factor for the bleed air system.">
 				<value>1</value>
 				<unit>1</unit>
@@ -159,7 +152,7 @@
 		<aircraft_systems>
 			<energy_sinks>
 				<number_of_sinks description="Number of energy sinks">
-					<value>9</value>
+					<value>8</value>
 					<default>20</default>
 				</number_of_sinks>
 				<system ID="0">
@@ -208,15 +201,6 @@
 					</operating_switch>
 				</system>
 				<system ID="5">
-					<system_description description="Type of oxygen system">
-						<value>conventionalOxygenSystem</value>
-					</system_description>
-					<operating_switch description="Switch whether the system is operated. Switch: true (on) / false (off, mass is determined anyway!)">
-						<value>true</value>
-						<default>true</default>
-					</operating_switch>
-				</system>
-				<system ID="6">
 					<system_description description="Type of gear system">
 						<value>conventionalGear</value>
 					</system_description>
@@ -225,7 +209,7 @@
 						<default>true</default>
 					</operating_switch>
 				</system>
-				<system ID="7">
+				<system ID="6">
 					<system_description description="Type of flight control system">
 						<value>conventionalFlightControl</value>
 					</system_description>
@@ -234,7 +218,7 @@
 						<default>true</default>
 					</operating_switch>
 				</system>
-				<system ID="8">
+				<system ID="7">
 					<system_description description="remaining consumer system">
 						<value>remainingConsumers</value>
 					</system_description>