Installation of an Auxiliary Power Unit (APU) Surge Control Valve Exhaust Modification.

Installation of an Auxiliary Power Unit (APU) Surge ControlValve Modification. EASA.IM.A.S.02884 FAA STC ST03570AT

Installation of Pratt & Whitney Engine Services, Inc. Data Transmission Unit (DTU).

Replacement of the inner aluminum barrel of the engine inlet cowl, withan inlet barrel of carbon graphite sandwich construction, to provide asolution for in-service corrosion. FAA STC ST04261AT