Plane: run is_crashed at 5hz instead of 1hz

ArduPlane/ArduPlane.cpp

@@ -328,8 +328,6 @@ void Plane::one_second_loop()
     AP_Notify::flags.pre_arm_gps_check = true;
     AP_Notify::flags.armed = arming.is_armed() || arming.arming_required() == AP_Arming::NO;
 
-    crash_detection_update();
-
 #if AP_TERRAIN_AVAILABLE
     if (should_log(MASK_LOG_GPS)) {
         terrain.log_terrain_data(DataFlash);

ArduPlane/is_flying.cpp

@@ -155,6 +155,8 @@ void Plane::update_is_flying_5Hz(void)
     }
     previous_is_flying = new_is_flying;
 
+    crash_detection_update();
+
     if (should_log(MASK_LOG_MODE)) {
         Log_Write_Status();
     }