Special Conditions: Pratt & Whitney Canada, Inc. (Formerly United Aircraft of Canada, Limited), Model PT6T-9 Turboshaft Engine

Pratt & Whitney Canada, Inc. (PWC) has applied for an amendment to type certificate (TC) #E22EA, to add a new model PT6T-9 turboshaft engine. The FAA has determined that this new model engine should be viewed as a derivative to the PT6T-3 engine. On June 8, 1970, the FAA issued Special Conditions (SC) No. 33-23-EA-6 for the PT6T-3 turboshaft engine model, and later amended those SC in 1970 to clarify a potential ambiguity in the vibration test requirements. In addition to the requirements contained in SC No. 33-23-EA-6, as amended, these new special conditions provide for 30-second one-engine-inoperative (OEI), 2-minute OEI, and continuous OEI ratings to be included in the PT6T-9 turboshaft engine model power ratings. The special conditions will define the changes to the engine certification basis that are required to establish a level of safety equivalent to the current requirements of 14 CFR part 33, for the new PWC PT6T-9 turboshaft engine model.