diff --git a/src/FDM/JSBSim/FGNozzle.cpp b/src/FDM/JSBSim/FGNozzle.cpp
index 1c66c476c..bbab52686 100644
--- a/src/FDM/JSBSim/FGNozzle.cpp
+++ b/src/FDM/JSBSim/FGNozzle.cpp
@@ -97,7 +97,7 @@ double FGNozzle::Calculate(double CfPc)
   Thrust = max((double)0.0, (CfPc * AreaT + (PE - pAtm)*Area2) * nzlEff);
   vFn(1) = Thrust * cos(ReverserAngle);
 
-  ThrustCoeff = CfPc / ((pAtm - PE) * Area2);
+  ThrustCoeff = max((double)0.0, CfPc / ((pAtm - PE) * Area2));
 
   return Thrust;
 }
diff --git a/src/FDM/JSBSim/FGThruster.h b/src/FDM/JSBSim/FGThruster.h
index 23dd31fc2..35cc9d3f0 100644
--- a/src/FDM/JSBSim/FGThruster.h
+++ b/src/FDM/JSBSim/FGThruster.h
@@ -95,6 +95,8 @@ public:
   virtual string GetThrusterLabels(int id);
   virtual string GetThrusterValues(int id);
 
+  inline void SetThrustCoefficient(double ct) { ThrustCoeff = ct; }
+
 protected:
   eType Type;
   string Name;
diff --git a/src/FDM/JSBSim/FGTrimAxis.cpp b/src/FDM/JSBSim/FGTrimAxis.cpp
index 27a82eadf..365947f04 100644
--- a/src/FDM/JSBSim/FGTrimAxis.cpp
+++ b/src/FDM/JSBSim/FGTrimAxis.cpp
@@ -437,7 +437,7 @@ void FGTrimAxis::AxisReport(void) {
            GetStateName().c_str(), GetState()+state_target, GetTolerance());
   cout << out;
 
-  if( abs(GetState()+state_target) < abs(GetTolerance()) )
+  if( fabs(GetState()+state_target) < fabs(GetTolerance()) )
      cout << "  Passed" << endl;
   else
      cout << "  Failed" << endl;
diff --git a/src/FDM/JSBSim/FGTurbine.cpp b/src/FDM/JSBSim/FGTurbine.cpp
index 51e8a3911..909413f8b 100644
--- a/src/FDM/JSBSim/FGTurbine.cpp
+++ b/src/FDM/JSBSim/FGTurbine.cpp
@@ -113,17 +113,20 @@ double FGTurbine::Calculate(void)
   if (Stalled) phase = tpStall;
   if (Seized) phase = tpSeize;
 
+  double CT = 0.0;
   switch (phase) {
     case tpOff:    Thrust = Off(); break;
-    case tpRun:    Thrust = Run(); break;
+    case tpRun:    Thrust = Run(CT); break;
     case tpSpinUp: Thrust = SpinUp(); break;
     case tpStart:  Thrust = Start(); break;
     case tpStall:  Thrust = Stall(); break;
     case tpSeize:  Thrust = Seize(); break;
-    case tpTrim:   Thrust = Trim(); break;
+    case tpTrim:   Thrust = Trim(CT); break;
     default: Thrust = Off();
   }
 
+  Thruster->SetThrustCoefficient(CT);
+
   return Thruster->Calculate(Thrust);
 }
 
@@ -147,12 +150,13 @@ double FGTurbine::Off(void)
 
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-double FGTurbine::Run(void)
+double FGTurbine::Run(double &TC)
 {
   double idlethrust, milthrust, thrust;
   double N2norm;   // 0.0 = idle N2, 1.0 = maximum N2
-  idlethrust = MilThrust * ThrustTables[0]->TotalValue();
-  milthrust = (MilThrust - idlethrust) * ThrustTables[1]->TotalValue();
+
+  idlethrust = ThrustTables[0]->TotalValue();
+  milthrust = (1.0 - idlethrust) * ThrustTables[1]->TotalValue();
 
   Running = true;
   Starter = false;
@@ -160,7 +164,8 @@ double FGTurbine::Run(void)
   N2 = Seek(&N2, IdleN2 + ThrottlePos * N2_factor, delay, delay * 3.0);
   N1 = Seek(&N1, IdleN1 + ThrottlePos * N1_factor, delay, delay * 2.4);
   N2norm = (N2 - IdleN2) / N2_factor;
-  thrust = idlethrust + (milthrust * N2norm * N2norm);
+  TC = idlethrust + (milthrust * N2norm * N2norm);
+  thrust = TC * MilThrust;
   EGT_degC = TAT + 363.1 + ThrottlePos * 357.1;
   OilPressure_psi = N2 * 0.62;
   OilTemp_degK = Seek(&OilTemp_degK, 366.0, 1.2, 0.1);
@@ -170,8 +175,8 @@ double FGTurbine::Run(void)
     FuelFlow_pph = Seek(&FuelFlow_pph, thrust * correctedTSFC, 1000.0, 100000);
     if (FuelFlow_pph < IdleFF) FuelFlow_pph = IdleFF;
     NozzlePosition = Seek(&NozzlePosition, 1.0 - N2norm, 0.8, 0.8);
-    thrust = thrust * (1.0 - BleedDemand);
-    EPR = 1.0 + thrust/MilThrust;
+    TC = TC * (1.0 - BleedDemand);
+    EPR = 1.0 + TC;
   }
 
   if (AugMethod == 1) {
@@ -180,7 +185,8 @@ double FGTurbine::Run(void)
   }
 
   if ((Augmented == 1) && Augmentation && (AugMethod < 2)) {
-    thrust = MaxThrust * ThrustTables[2]->TotalValue();
+    TC = ThrustTables[2]->TotalValue();
+    thrust = TC * MaxThrust;
     FuelFlow_pph = Seek(&FuelFlow_pph, thrust * ATSFC, 5000.0, 10000.0);
     NozzlePosition = Seek(&NozzlePosition, 1.0, 0.8, 0.8);
   }
@@ -188,8 +194,9 @@ double FGTurbine::Run(void)
   if (AugMethod == 2) {
     if (AugmentCmd > 0.0) {
       Augmentation = true;
-      double tdiff = (MaxThrust * ThrustTables[2]->TotalValue()) - thrust;
-      thrust += (tdiff * AugmentCmd);
+      double tdiff = ThrustTables[2]->TotalValue() - TC;
+      TC += (tdiff * AugmentCmd);
+      thrust = TC * MaxThrust;
       FuelFlow_pph = Seek(&FuelFlow_pph, thrust * ATSFC, 5000.0, 10000.0);
       NozzlePosition = Seek(&NozzlePosition, 1.0, 0.8, 0.8);
     } else {
@@ -197,8 +204,10 @@ double FGTurbine::Run(void)
     }
   }
 
-  if ((Injected == 1) && Injection)
+  if ((Injected == 1) && Injection) {
+    TC = TC * ThrustTables[3]->TotalValue();
     thrust = thrust * ThrustTables[3]->TotalValue();
+  }
 
   ConsumeFuel();
   if (Cutoff) phase = tpOff;
@@ -281,16 +290,21 @@ double FGTurbine::Seize(void)
 
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-double FGTurbine::Trim(void)
+double FGTurbine::Trim(double &TC)
 {
     double idlethrust, milthrust, thrust, tdiff;
-    idlethrust = MilThrust * ThrustTables[0]->TotalValue();
-    milthrust = (MilThrust - idlethrust) * ThrustTables[1]->TotalValue();
-    thrust = (idlethrust + (milthrust * ThrottlePos * ThrottlePos)) * (1.0 - BleedDemand);
+    idlethrust = ThrustTables[0]->TotalValue();;
+    milthrust = (1.0 - TC) * ThrustTables[1]->TotalValue();
+    TC = (idlethrust + (milthrust * ThrottlePos * ThrottlePos))
+          * (1.0 - BleedDemand);
     if (AugmentCmd > 0.0) {
-      tdiff = (MaxThrust * ThrustTables[2]->TotalValue()) - thrust;
-      thrust += (tdiff * AugmentCmd);
-      }
+      tdiff = ThrustTables[2]->TotalValue() - TC;
+      TC += (tdiff * AugmentCmd);
+      thrust = TC * MaxThrust;
+
+     } else
+      thrust = TC * MilThrust;
+
     return thrust;
 }
 
diff --git a/src/FDM/JSBSim/FGTurbine.h b/src/FDM/JSBSim/FGTurbine.h
index fc87e2eeb..547d5da75 100644
--- a/src/FDM/JSBSim/FGTurbine.h
+++ b/src/FDM/JSBSim/FGTurbine.h
@@ -233,12 +233,12 @@ private:
   double NozzlePosition;
 
   double Off(void);
-  double Run(void);
+  double Run(double &CT);
   double SpinUp(void);
   double Start(void);
   double Stall(void);
   double Seize(void);
-  double Trim(void);
+  double Trim(double &CT);
 
   void SetDefaults(void);
   bool Load(FGConfigFile *ENG_cfg);