Pratt & Whitney Canada Renews Covington Engines’ DOF Certification

For Immediate ReleaseJanuary 25, 2023 For more information contact:Eric RojekCovington Aircraft Pratt & Whitney Canada Renews Covington Engines’ DOF Certification Okmulgee, OK – In addition to heralding their 50th year in business, Covington Aircraft Enginesis celebrating renewal of their certification as a Pratt & Whitney Canada (P&WC) Designated Overhaul Facility (DOF). As a DOF, … Continued


From time to time, I would like to talk about unscheduled events on the PT6A engine. Unscheduled events are the incidents that none of us want or need, but they do happen despite our best efforts. There is a pretty big list in the maintenance manual of events that Pratt & Whitney Canada describe as … Continued


For over 50 years, operators of various PT6 engine models have endured Hot Starts.  In this article, we will talk about what a Hot Start is, how they occur, and the best practices to prevent Hot Starts from happening.  Exceeding temperature limits during a turbine start can cause severe engine damage and cost over $100,000 … Continued

Pratt & Whitney Canada – Commercial Support Programs

Pratt and Whitney Canada has active Commercial Support Programs (CSP) to help operators comply with certain Service Bulletins (SBs).  A CSP campaign provides operators with replacement parts at a significant discount to encourage compliance before a possible event may occur.  CSP is an opportunity to comply with a recommended replacement interval in order to address … Continued

Diving Into Oil

PT6… Craymer’s Counsel I have received questions and heard many discussions about oil recently, so this month, let’s dive into oil. When it comes to engine oil there are several choices and your experience has helped you determine the correct type of oil for your operation.  Just for knowledge, Pratt and Whiney Canada provides lists … Continued

Cycle Tracking

PT6… Craymer’s Counsel In 2021, we celebrated the 100th year of agricultural aviation and I celebrated my 25th year with Covington Aircraft. Many achievements in life are marked by time. “Let every man be master of his time.” ― William Shakespeare.  Now many of you are wondering, Craymer how are you going to talk about engine … Continued

Understanding a Borescope Inspection

PT6… Craymer’s Counsel For those that don’t know me, my name is Robert Craymer and I work for Covington Aircraft. I have worked in and around PT6A’s for over 30 years. I still get to hear and learn new things and I always tell everyone that, “I may not know everything about engines, but I … Continued

Engine Preservation

PT6… Craymer’s Counsel Holidays, hunting, family and fun! It is that time of year for North America Ag Aviation. For many the airplanes are scheduled for annual inspection or put to bed until next season. For some operators the season continues well into the upcoming months. For those who are done for the season, this … Continued

The Need for a Hot Section Inspection

One of the maintenance items that is frequently discussed is the need for a hot section inspection. While hot section inspection time requirements may differ by engine model, the “mid TBO” recommendation usually applies or when performance loss dictates.  For example, on the PT6A-34 engine TBO (Time Between Overhauls) is 4000 hours and hot sections … Continued

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