diff --git a/ArduCopter/GCS_Mavlink.pde b/ArduCopter/GCS_Mavlink.pde
index 334eadfd05..60a532f1ea 100644
--- a/ArduCopter/GCS_Mavlink.pde
+++ b/ArduCopter/GCS_Mavlink.pde
@@ -1144,8 +1144,7 @@ void GCS_MAVLINK::handleMessage(mavlink_message_t* msg)
                 init_barometer(false);
                 result = MAV_RESULT_ACCEPTED;
             } else if (packet.param4 == 1) {
-                trim_radio();
-                result = MAV_RESULT_ACCEPTED;
+                result = MAV_RESULT_UNSUPPORTED;
             } else if (packet.param5 == 1) {
                 // 3d accel calibration
                 float trim_roll, trim_pitch;
diff --git a/ArduCopter/radio.pde b/ArduCopter/radio.pde
index 549be8f5ac..b1862923fc 100644
--- a/ArduCopter/radio.pde
+++ b/ArduCopter/radio.pde
@@ -185,20 +185,4 @@ static void set_throttle_zero_flag(int16_t throttle_control)
     } else if (tnow_ms - last_nonzero_throttle_ms > THROTTLE_ZERO_DEBOUNCE_TIME_MS) {
         ap.throttle_zero = true;
     }
-}
-
-static void trim_radio()
-{
-    for (uint8_t i = 0; i < 30; i++) {
-        read_radio();
-    }
-
-    g.rc_1.trim();      // roll
-    g.rc_2.trim();      // pitch
-    g.rc_4.trim();      // yaw
-
-    g.rc_1.save_eeprom();
-    g.rc_2.save_eeprom();
-    g.rc_4.save_eeprom();
-}
-
+}
\ No newline at end of file