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Flight Sim With Quaternions

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Hi, I am trying to rotate my plane model with quaternions and I somehow manage to do it by accident. My code is as follow
void D3DAdapter::MoveObjectQ(int direction)
	float fRoll, fYaw, fPitch;
	fRoll = fYaw = fPitch = 0.0f;

		case D3DAdapter::ROLL_LEFT:
			fRoll -= m_speed;

		case D3DAdapter::ROLL_RIGHT:
			fRoll += m_speed;

		case D3DAdapter::YAW_LEFT:
			fYaw -= m_speed;

		case D3DAdapter::YAW_RIGHT:
			fYaw += m_speed;

		case D3DAdapter::PITCH_DOWN:
			fPitch -= m_speed;

		case D3DAdapter::PITCH_UP:
			fPitch += m_speed;

	D3DXMATRIX matAdd, matTrans;

	D3DXVECTOR3 lookAtVt(0.0f, 0.0f, -1.0f);
	D3DXQUATERNION additionalQ;
	D3DXQuaternionRotationYawPitchRoll(&additionalQ, fYaw, fPitch, fRoll);

	aeroplane.rotQuaternion *= additionalQ;
	D3DXMatrixRotationQuaternion(&matAdd, &aeroplane.rotQuaternion);
	D3DXMatrixInverse(&matAdd, NULL, &matAdd);
	D3DXVec3TransformCoord(&lookAtVt, &lookAtVt, &matAdd);
	//matLocal = matAdd;
	//D3DXVECTOR3 lookVt(matLocal._21, matLocal._22, matLocal._23);
	if(direction == D3DAdapter::FORWARD)
		aeroplane.pos.x += m_speed * lookAtVt.x;
		aeroplane.pos.y += m_speed * lookAtVt.y;
		aeroplane.pos.z += m_speed * lookAtVt.z;
	else if(direction == D3DAdapter::BACKWARD)
		aeroplane.pos.x -= m_speed * lookAtVt.x;
		aeroplane.pos.y -= m_speed * lookAtVt.y;
		aeroplane.pos.z -= m_speed * lookAtVt.z;
	D3DXMatrixTranslation(&matTrans, aeroplane.pos.x, aeroplane.pos.y, aeroplane.pos.z);

	matAdd *= matTrans;
	matLocal = matAdd;

The question I have is when I didn't inverse the rotation matrix generated from using the quaternion, the rotation didn't work. Anyone knows why?

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