Fig. 1. The endotracheal tube marked A  is positioned with the bevel down , as recommended for orotracheal fiberoptic intubation to prevent obstruction to endotracheal tube passage by the right arytenoid cartilage. The endotracheal tube marked B  is the usual bevel orientation (bevel left ) used during rigid laryngoscopy and intubation. The endotracheal tube marked C  is positioned with the bevel up , as recommended for nasotracheal fiberoptic intubation to prevent obstruction to endotracheal tube passage by the epiglottis.