SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
_serviceable_node = node->getChild("serviceable", 0, true);
_pressure_in_node = fgGetNode("/environment/pressure-inhg", true);
_pressure_out_node = node->getChild("pressure-inhg", 0, true);
SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
_serviceable_node = node->getChild("serviceable", 0, true);
_pressure_in_node = fgGetNode("/environment/pressure-inhg", true);
_pressure_out_node = node->getChild("pressure-inhg", 0, true);