diff --git a/src/Airports/GenAirports850/linearfeature.cxx b/src/Airports/GenAirports850/linearfeature.cxx
index 63b734af..a2c6ca8b 100644
--- a/src/Airports/GenAirports850/linearfeature.cxx
+++ b/src/Airports/GenAirports850/linearfeature.cxx
@@ -604,6 +604,11 @@ int LinearFeature::Finish( bool closed, unsigned int idx )
                 cur_light_contour.SetType( "RWY_RED_LIGHTS" );
                 light_delta = 10.0f;
                 break;
+            
+            default:
+                // catch unknown lighting type. Allows TerraGear to exit cleanly when it comes across new light features 107 and 108
+                TG_LOG(SG_GENERAL, SG_ALERT, "LinearFeature::Finish: unknown lighting feature " << lights[i]->type );
+                exit(1);
         }
 
         for (unsigned int j = lights[i]->start_idx; j <= lights[i]->end_idx; j++)
diff --git a/src/Airports/GenAirports850/linearfeature.hxx b/src/Airports/GenAirports850/linearfeature.hxx
index 4ccc34a0..0111e9d2 100644
--- a/src/Airports/GenAirports850/linearfeature.hxx
+++ b/src/Airports/GenAirports850/linearfeature.hxx
@@ -40,6 +40,8 @@
 #define LF_UNIDIR_CLOSE_AMBER_PULSE (104)
 #define LF_BIDIR_GREEN_AMBER        (105)
 #define LF_OMNIDIR_RED              (106)
+#define LF_OMNIDIR_GREEN            (107)
+#define LF_OMNIDIR_GREEN_AMBER      (108)
 
 struct Marking
 {