def METHOD_NAME(self, index):
    if index is None:
        return False
    if index < self.FANTRAY_NUM_START_IDX or index > self.FANTRAY_NUM_START_IDX + self.num_fans - 1:
        logging.error('Invalid FAN index:%d', index)
        return False
    tray_index = ((index-1)/self.NUM_FANS_PERTRAY) + 1
    fantray_front_speed=self.get_front_fan_speed(tray_index)
    fantray_rear_speed=self.get_rear_fan_speed(tray_index)
    if (fantray_front_speed != '0' and fantray_rear_speed != '0'):
        return True
    else:
        return False