Telescopes are traditionally operated on earth or in space. For both environments a lot of experience and data are available, which allow a proper and straightforward design. Not so an airborne telescope, which will be used on a transport aircraft, not only for science but also for public outreach, with school classes flying with the observatory. Therefore the telescope as a part of the aircraft must be certified by the `Federal Aviation Administration'. Because the telescope as a permanently mounted payload amends or even supersedes safety relevant parts of the aircraft, the rules applied to the TA are identical to the standard regulations for the basic airplane. However, these rules are obviously not tailored to airborne telescopes. The presentation explains the major rules applicable for the TA and the process to prove the compliance with these rules. Furthermore, the influence on design and manufacturing of telescope assemblies is shown.