diff --git a/VectoCommon/VectoCommon/InputData/EngineeringInputData.cs b/VectoCommon/VectoCommon/InputData/EngineeringInputData.cs
index 823986e91539a882b4d3ed297e0b8a71633ff8eb..320a9542b61eb1ecfe5b74f22dea3f4b4bb5c4df 100644
--- a/VectoCommon/VectoCommon/InputData/EngineeringInputData.cs
+++ b/VectoCommon/VectoCommon/InputData/EngineeringInputData.cs
@@ -292,6 +292,11 @@ namespace TUGraz.VectoCommon.InputData
 
 	public interface IAuxiliaryEngineeringInputData : IAuxiliaryDeclarationInputData
 	{
+		/// <summary>
+		/// either mapping or constant
+		/// </summary>
+		AuxiliaryDemandType AuxiliaryType { get; }
+
 		/// <summary>
 		/// P022  Aux-InputFile: transmission ratio
 		/// cf. VECTO Input Parameters.xlsx
@@ -315,5 +320,11 @@ namespace TUGraz.VectoCommon.InputData
 		/// cf. VECTO Input Parameters.xlsx
 		/// </summary>
 		DataTable DemandMap { get; }
+
+		/// <summary>
+		/// P178
+		/// additional constant auxiliary load, similar to Padd; not specified in the cycle but as auxiliary
+		/// </summary>
+		Watt ConstantPowerDemand { get; }
 	}
 }
\ No newline at end of file
diff --git a/VectoCore/VectoCore/InputData/Impl/InputData.cs b/VectoCore/VectoCore/InputData/Impl/InputData.cs
index a399887f6b3b8b54ccd40224cd5169b476ca7567..f8885121f9aa09a4caa9b2b84b6621f491e24474 100644
--- a/VectoCore/VectoCore/InputData/Impl/InputData.cs
+++ b/VectoCore/VectoCore/InputData/Impl/InputData.cs
@@ -138,6 +138,14 @@ namespace TUGraz.VectoCore.InputData.Impl
 
 	public class AuxiliaryDataInputData : IAuxiliaryEngineeringInputData
 	{
+		public AuxiliaryDataInputData()
+		{
+			AuxiliaryType = AuxiliaryDemandType.Mapping;
+			ConstantPowerDemand = 0.SI<Watt>();
+		}
+
+		public AuxiliaryDemandType AuxiliaryType { get; internal set; }
+
 		public bool SavedInDeclarationMode { get; internal set; }
 
 		public string ID { get; internal set; }
@@ -155,5 +163,7 @@ namespace TUGraz.VectoCore.InputData.Impl
 		public double EfficiencyToSupply { get; internal set; }
 
 		public DataTable DemandMap { get; internal set; }
+
+		public Watt ConstantPowerDemand { get; internal set; }
 	}
 }
\ No newline at end of file