diff --git a/C/src/xplaneConnect.c b/C/src/xplaneConnect.c
index 9157b35..98be7f5 100755
--- a/C/src/xplaneConnect.c
+++ b/C/src/xplaneConnect.c
@@ -560,13 +560,13 @@ int sendCTRL(XPCSocket sock, float values[], int size, char ac)
 	}
 	if (size < 1 || size > 7)
 	{
-		printError("sendCTRL", "size should be a value between 1 and 6.");
+		printError("sendCTRL", "size should be a value between 1 and 7.");
 		return -2;
 	}
 
 	// Setup Command
 	// 5 byte header + 5 float values * 4 + 2 byte values
-	unsigned char buffer[27] = "CTRL";
+	unsigned char buffer[31] = "CTRL";
 	int cur = 5;
 	for (int i = 0; i < 6; i++)
 	{
@@ -587,9 +587,10 @@ int sendCTRL(XPCSocket sock, float values[], int size, char ac)
 		}
 	}
 	buffer[26] = ac;
+	*((float*)(buffer + 27)) = size == 7 ? values[6]: -998;
 
 	// Send Command
-	if (sendUDP(sock, buffer, 27) < 0)
+	if (sendUDP(sock, buffer, 31) < 0)
 	{
 		printError("sendCTRL", "Failed to send command");
 		return -3;
diff --git a/C/src/xplaneConnect.h b/C/src/xplaneConnect.h
index e8520c3..abcfd1f 100644
--- a/C/src/xplaneConnect.h
+++ b/C/src/xplaneConnect.h
@@ -182,8 +182,8 @@ int sendPOSI(XPCSocket sock, float values[], int size, char ac);
 ///
 /// \param sock   The socket to use to send the command.
 /// \param values An array representing position data about the aircraft. The format of values is
-///               [Elevator, Aileron, Rudder, Throttle, Gear, Flaps]. If less than 6 values are
-///               specified, the unspecified values will be left unchanged.
+///               [Elevator, Aileron, Rudder, Throttle, Gear, Flaps, Speed Brakes]. If less than
+///               6 values are specified, the unspecified values will be left unchanged.
 /// \param size   The number of elements in values.
 /// \param ac     The aircraft number to set the control surfaces of. 0 for the player aircraft.
 /// \returns      0 if successful, otherwise a negative value.
diff --git a/TestScripts/C Tests/main.c b/TestScripts/C Tests/main.c
index 83a23c8..2718c3d 100644
--- a/TestScripts/C Tests/main.c	
+++ b/TestScripts/C Tests/main.c	
@@ -516,6 +516,97 @@ int sendCTRLTest()
 	return 0;
 }
 
+
+int sendCTRLspeedbrakeTest() // sendCTRL test
+{
+	// Initialize
+	char* dref = "sim/flightmodel/controls/sbrkrqst";
+	float data;
+	int size = 1;
+	float CTRL[7] = { -998.0F, -998.0F, -998.0F, -998.0F, -998.0F, -998.0F, -0.5F };
+	XPCSocket sock = openUDP(IP);
+
+	// Execute 1
+	// Arm speedbrakes
+	sendCTRL(sock, CTRL, 7, 0);
+	int result = getDREF(sock, dref, &data, &size);
+
+	// Close socket
+	closeUDP(sock);
+
+	// Tests
+	if (result < 0)
+	{
+		return -1;
+	}
+	if (data != 0.5F)
+	{
+		return -11;
+	}
+
+	sock = openUDP(IP);
+	// Execute 2
+	// Set full speedbrakes
+	CTRL[6] = 1.0F;
+	sendCTRL(sock, CTRL, 7, 0);
+	result = getDREF(sock, dref, &data, &size);
+
+	// Close socket
+	closeUDP(sock);
+
+	// Tests
+	if (result < 0)
+	{
+		return -2;
+	}
+	if (data != 1.0F)
+	{
+		return -21;
+	}
+
+	sock = openUDP(IP);
+	// Execute 3
+	// Retract speedbrakes
+	CTRL[6] = 0.0F;
+	sendCTRL(sock, CTRL, 6, 0);
+	result = getDREF(sock, dref, &data, &size);
+
+	// Close socket
+	closeUDP(sock);
+
+	// Tests
+	if (result < 0)
+	{
+		return -3;
+	}
+	if (data != 0.0F)
+	{
+		return -31;
+	}
+
+	sock = openUDP(IP);
+	// Execute 4
+	// Verify -998 does not change value.
+	CTRL[6] = -998.0F;
+	sendCTRL(sock, CTRL, 6, 0);
+	result = getDREF(sock, dref, &data, &size);
+
+	// Close socket
+	closeUDP(sock);
+
+	// Tests
+	if (result < 0)
+	{
+		return -4;
+	}
+	if (data != 0.0F)
+	{
+		return -41;
+	}
+
+	return 0;
+}
+
 int psendPOSITest() // sendPOSI test
 {
 	// Initialization
@@ -952,6 +1043,7 @@ int main(int argc, const char * argv[])
 	runTest(sendDATATest, "DATA");
 	runTest(sendCTRLTest, "CTRL");
 	runTest(psendCTRLTest, "CTRL (player)");
+	runTest(sendCTRLspeedbrakeTest, "CTRL (speedbrake)");
 	runTest(sendPOSITest, "POSI");
 	runTest(psendPOSITest, "POSI (player)");
 	runTest(sendWYPTTest, "WYPT");