67 Pa. Code § 476.13 – Mandatory services.

(a) Primary services. The FBO shall provide aircraft fueling and oil dispensing services as set forth in § 476.14 (relating to aircraft fueling and oil dispensing services), and aircraft parking, tie-down and hangar storage services as set forth in § 476.15 (relating to aircraft parking, tie-down and hangar storage services).
(b) Secondary services. In addition to the services set forth in subsection (a), the FBO shall provide two of the following services:
1. (1) Airframe, power plant and accessory services as set forth in § 476.16 (relating to airframe, power plant and accessory services).
2. (2) Radio and instrument services as set forth in § 476.17 (relating to radio and instrument services).
3. (3) Air taxi and charter services as set forth in § 476.18 (relating to air taxi and charter services).
4. (4) Flight training services as set forth in § 476.19 (relating to flight training services).
5. (5) Ground handling support services as set forth in § 476.20 (relating to ground handling support services).