0xFF

А ТУ-154? https://ru.wikipedia.org/wiki/%D0%9A%D0%B0%D1%82%D0%B0%D1%81%D1%82%D1%80%D0%BE%D1%84%D0%B0_%D0%A2%D1%83-154_%D0%BD%D0%B0%D0%B4_%D0%A7%D1%91%D1%80%D0%BD%D1%8B%D0%BC_%D0%BC%D0%BE%D1%80%D0%B5%D0%BC