diff --git a/EKF/estimator_interface.h b/EKF/estimator_interface.h
index 2e5a3aca1a..17b453fb75 100644
--- a/EKF/estimator_interface.h
+++ b/EKF/estimator_interface.h
@@ -63,6 +63,9 @@ public:
 	// gets the innovations of the earth magnetic field measurements
 	virtual void get_mag_innov(float mag_innov[3]) = 0;
 
+	// gets the innovation of airspeed measurement
+ 	virtual void get_airspeed_innov(float *airspeed_innov) = 0;
+
 	// gets the innovations of the heading measurement
 	virtual void get_heading_innov(float *heading_innov) = 0;
 
@@ -73,6 +76,9 @@ public:
 	// gets the innovation variances of the earth magnetic field measurements
 	virtual void get_mag_innov_var(float mag_innov_var[3]) = 0;
 
+	// gets the innovation variance of the airspeed measurement
+ 	virtual void get_airspeed_innov_var(float *get_airspeed_innov_var) = 0;
+
 	// gets the innovation variance of the heading measurement
 	virtual void get_heading_innov_var(float *heading_innov_var) = 0;
 
@@ -229,8 +235,8 @@ protected:
 	bool _mag_healthy;              // computed by mag innovation test
 	float _yaw_test_ratio;          // yaw innovation consistency check ratio
 	float _mag_test_ratio[3];       // magnetometer XYZ innovation consistency check ratios
-
 	float _vel_pos_test_ratio[6];   // velocity and position innovation consistency check ratios
+	float _tas_test_ratio;			// tas innovation consistency check ratio
 
 	// data buffer instances
 	RingBuffer<imuSample> _imu_buffer;