diff --git a/src/AIModel/AIFlightPlanCreatePushBack.cxx b/src/AIModel/AIFlightPlanCreatePushBack.cxx
index 57cd9a78f..bf256bac9 100644
--- a/src/AIModel/AIFlightPlanCreatePushBack.cxx
+++ b/src/AIModel/AIFlightPlanCreatePushBack.cxx
@@ -83,7 +83,7 @@ bool FGAIFlightPlan::createPushBack(FGAIAircraft *ac,
                 pushBackWaypoint(wpt);
             }
             //cerr << "Success : GateId = " << gateId << endl;
-            SG_LOG(SG_AI, SG_WARN, "Warning: Succesfully found a parking for a " <<
+            SG_LOG(SG_AI, SG_WARN, "Warning: Successfully found a parking for a " <<
                    aircraftType <<
                    " of flight type " << fltType <<
                    " of airline     " << airline <<
diff --git a/src/Airports/runways.hxx b/src/Airports/runways.hxx
index 651f1e68e..92647461d 100644
--- a/src/Airports/runways.hxx
+++ b/src/Airports/runways.hxx
@@ -78,7 +78,7 @@ public:
   { return _isReciprocal; }
 
   /**
-   * Get the runway begining point - this is syntatic sugar, equivalent to
+   * Get the runway beginning point - this is syntatic sugar, equivalent to
    * calling pointOnCenterline(0.0);
    */
   SGGeod begin() const;
diff --git a/src/Instrumentation/gps.cxx b/src/Instrumentation/gps.cxx
index e9a91dcaa..3d15e8e57 100644
--- a/src/Instrumentation/gps.cxx
+++ b/src/Instrumentation/gps.cxx
@@ -673,7 +673,7 @@ void GPS::referenceNavaidSet(const std::string& aNavaid)
 
   if (_ref_navaid) {
     _ref_navaid_set = true;
-    SG_LOG(SG_INSTR, SG_INFO, "GPS code set explict ref-navaid:" << _ref_navaid->ident());
+    SG_LOG(SG_INSTR, SG_INFO, "GPS code set explicit ref-navaid:" << _ref_navaid->ident());
     _ref_navaid_id_node->setStringValue(_ref_navaid->ident().c_str());
     _ref_navaid_name_node->setStringValue(_ref_navaid->name().c_str());
     FGNavRecord* vor = (FGNavRecord*) _ref_navaid.ptr();
@@ -855,7 +855,7 @@ void GPS::beginTurn()
 {
   _inTurn = true;
   _turnSequenced = false;
-  SG_LOG(SG_INSTR, SG_INFO, "begining turn");
+  SG_LOG(SG_INSTR, SG_INFO, "beginning turn");
 }
 
 void GPS::endTurn()
diff --git a/src/Systems/electrical.cxx b/src/Systems/electrical.cxx
index 3ff556e28..947df0aae 100644
--- a/src/Systems/electrical.cxx
+++ b/src/Systems/electrical.cxx
@@ -638,7 +638,7 @@ float FGElectricalSystem::propagate( FGElectricalComponent *node, double dt,
         }
         // cout << s << "  input_volts = " << volts << endl;
     } else {
-        SG_LOG( SG_SYSTEMS, SG_ALERT, "unkown node type" );
+        SG_LOG( SG_SYSTEMS, SG_ALERT, "unknown node type" );
     }
 
     int i;
diff --git a/tests/alcinfo.cxx b/tests/alcinfo.cxx
index 2f569390d..85d2a27ec 100644
--- a/tests/alcinfo.cxx
+++ b/tests/alcinfo.cxx
@@ -145,7 +145,7 @@ int main(int argc, char **argv)
    if ((error = alGetError()) != AL_NO_ERROR)
       printf("Error #%x: %s\n", error, alGetString(error));
    else if (!s)
-      printf("Quering AL_VERSION returned NULL pointer!\n");
+      printf("Querying AL_VERSION returned NULL pointer!\n");
    else
       printf("OpenAL version string: %s\n", s);