Tag Archives: aircraft engines

Aircraft Engines: Liquid-Cooled vs. Air-Cooled

Many experts in the field of aircraft engine overhaul have debated over whether aircraft engines should be air cooled or liquid cooled, although the fact is that both types of systems deliver waste heat into the air eventually.  There are pros and cons to both types of engines, and the debate as to which is the better option appears to continue.

Continue reading Aircraft Engines: Liquid-Cooled vs. Air-Cooled

Covington Aircraft January In Review

The Importance of Aircraft Engine Overhaul

Aircraft engine overhaul can significantly increase the resale value of an aircraft, but even more importantly, an overhaul can extend the life of an aircraft engine and make the aircraft safer to fly.  Normal wear on the metal parts of an aircraft engine can lead to tolerance increases and poor performance, which could eventually lead to engine failure.  In addition, an aircraft engine overhaul allows for mechanical inspection of the engine to diagnose an issue before it becomes a major problem………read more.

Parts, Maintenance and Overhaul of Engines of Aircraft

Looking for the perfect place to find parts for your aircraft engines ?  Need maintenance on your aircraft’s engine?  Is it time for an overhaul of your aircraft engines?  If you answered yes to any of these questions, Covington Aircraft has just what you need.  An authorized Pratt & Whitney Canada distributor and a certified FAA repair station, Covington offers outstanding customer service through their highly trained and qualified staff……read more.

Aircraft Engine Repair Fly In Facility

When your aircraft engine needs servicing or maintenance, you want to make sure it gets the attention it deserves.

That’s one of the reasons Covington Aircraft created their aircraft engine repair Fly-In Facility.

Located just outside of Tulsa, Oklahoma on the Okmulgee, Oklahoma airport, the Fly-In Facility is nearly 50,000 square feet of state-of-the-art hangar space.  The Hangars are designed to effectively service a variety of aircraft……..read more.

Why Is Plane Maintenance So Important?

There is no denying that plane maintenance is one of the most critical aspects of plane ownership.  In fact, the FAA places so much importance on plane safety that they require a thorough aviation maintenance and inspection process for every 100 hours that a plane is used for hire.  For this reason, aircraft technicians must be highly skilled and demonstrate a keen attention to detail when it comes to aircraft maintenance…….read more.

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Parts, Maintenance and Overhaul of Engines of Aircraft

Looking for the perfect place to find parts for your aircraft engines ?  Need maintenance on your aircraft’s engine?  Is it time for an overhaul of your aircraft engines?  If you answered yes to any of these questions, Covington Aircraft has just what you need.  An authorized Pratt & Whitney Canada distributor and a certified FAA repair station, Covington offers outstanding customer service through their highly trained and qualified staff.


Parts-Maintenance-and-Overhaul-of-Engines-of-Aircraft-448x198Turbine Engines

A Designated Overhaul Facility (DDOF), Covington specializes in PT6A Turboprop engines maintenance, repair and overhaul.  Covington also offers airframe work performed by qualified  mechanics and is qualified to perform warranty work on the PT6A series engines for Pratt & Whitney Canada.  In addition, Covington can even perform your engine change at our 47,000 square-foot hangar in Okmulgee, Okla., or we can do the work at your location.

Radial Engines

Covington’s Radial Engine Division is the largest R-985 and R-1340 overhaul facility in the world.  This highly specialized facility ise authorized to repair or overhaul R-985, R-1340, and R-1340 Geared radial Pratt & Whitney engines .  Because Covington understands that an airplane on the ground is costing money, they are known throughout the industry for their fast turnaround times.  The mechanics will perform thorough inspections on your aircraft or engine, and the staff proudly provides exceptional, personalized customer service.


Because Covington Aircraft is well aware of how an aircraft on the ground can affect your business, they go beyond the call of duty to get your aircraft or engine repaired and in the air as fast as possible.  One way they are able to do that is by stocking a full line of replacement parts and accessories that are easily accessible.  This fully stocked parts department reduces the need for mechanics to wait for a specific part to be delivered, getting your plane repaired and flying as quickly as possible.

Whether you have one aircraft or a fleet of 50 or more, Covington will look out for your best interests as they have built their reputation on with a “one aircraft, one customer” philosophy.  Covington employes some of the  leading expert mechanics in the industry and trained them to provide the best customer service they can offer.  Covington is proud of the fact that they have “big shop knowledge” in a family shop atmosphere.  Covington’s personalized customer service and expert mechanical knowledge will have you back up in the air and flying in no time.

The Terminology and Standards of Aircraft Engine Overhaul – Part 1

This is the first post of two in our efforts to educate aviation enthusiasts, aircraft owners, and business fleet aircraft managers on the terminology of an aircraft engine overhaul.  If you are in need of maintenance or overhaul for your radial or turbine engine, make sure you visit Covington Aircraft’s website for more information!

When TBO time rolls around, are you ready to speak and understand the language enough to make an informed decision?

Air-Tractor-Landing-at-Hangar-1024x676Parents everywhere tell their children, “Read everything before you sign it.”  What good is this advice if you have no understanding of what you are reading?  Sure, many things are intuitive, but a clear understanding of what is offered for services further ensures that you will get value for your dollar.  The following is a listing and discussion of what various terms mean when it comes to aircraft engine overhaul. You may not know how to check the free-play on a valve tappet after reading this, but at least you should know your O.E.M from aftermarket enough to discuss your options.

Terms that are used and approved by the FAA.


A new engine is one that has been manufactured from all new parts and tested by an FAA-approved manufacturer.  The engine will have no operating history except for test cell time when received.  No FAA-approved manufacturer can approve another entity to manufacture or assemble a NEW ENGINE.


These are the FAA-approved fits and clearances manufacturers adhere to with new engine.  This may be accomplished using standard or approved undersized and oversized dimensioned parts.


The service limits are the FAA-approved allowable wear fits and tolerances to which a new limit part may deteriorate and still be a useable component.  This may also be accomplished using standard and approved undersized and oversized dimensions.


Chey-5-300x225An engine that has been disassembled, cleaned, inspected, repaired in accordance with manufacture overhaul instructions and tested using FAA-approved procedures.  The engine may be overhauled to new limits or service limits and still be considered an FAA-approved overhaul.  The engine’s previous operating history is maintained and it is returned to you with zero time since a major overhaul and a total time since new.  Of course, the total time since new is the same as before the overhaul.


This is an engine that has been overhauled using new and used parts to new limits by the manufacturer or an entity approved by the manufacturer.  The engine’s previous operating history is eradicated, even though the engine may have used components installed that have many hours of operating history, and it comes to you with zero hours total time in service


When an engine is overhauled or rebuilt, the new parts that are used during the repair process can come from a variety of sources.  An “O.E.M.” part is a new part that is manufactured by the original engine manufacturer to stringent FAA standards.  An “aftermarket” part is a new part that is manufactured by someone other than the original engine manufacturer and meets or exceeds the same stringent FAA guidelines as a new O.E.M. part.

So, now you know enough to be dangerous! However, put your aircraft engine overhaul into the hands of the experts who have performed thousands upon thousands, either at the Hangar in Okmulgee, OK or wherever you are located, and give Covington Aircraft a call today!  Next week we will go over some other aircraft maintenance terminology. Happy Flying!

Turbine Engines Education Series – Types of Turbine Engines

Turbine engines are classified according to whether the compressor is centrifugal flow, axial flow or a combination of both centrifugal and axial.  The type of engine is further classified by the path the air takes through the engine and how power is produced.  There are four different types of turbine engines – turbojet, turboprop, turbofan and turboshaft.



A turbojet engine was first developed in Germany and England prior to World War II and is the simplest of all jet engines.  The four sections of a turbojet engine are the compressor, combustion chamber, turbine section and exhaust.  The compressor passes air at a high rate of speed to the combustion chamber which contains the fuel inlet and igniter.  Expanding air drives the turbine and accelerated exhaust gases provide thrust.  These engines are limited on range and endurance and today are mostly used in military aviation.  They are known for being slow to respond to throttle applications at slow compressor speeds.



Between 1939 and 1942, a Hungarian designer, Gyorgy Jendrassik designed the first turboprop engine.  However, the design was not implemented into an actual aircraft until Rolls Royce converted a Derwint II into the RB50 Trent which flew on September 20, 1945 as the first turboprop jet engine.  A turboprop engine drives a propeller through a reduction gear, allowing optimum propeller performance to be achieved at much slower speeds than the operating RPM.  With their ability to perform well at slow airspeeds and fuel efficiency, turboprop engines are often used in small, commuter aircraft and agricultural applications due to their greater reliability offsetting their higher initial cost.  One of the most reliable turboprop engines is the Pratt & Whitney PT6A.



Turbofan jet engines were designed to merge the best features of the turbojet and turboprop.  By diverting a secondary airflow around the combustion chamber, additional thrust was created.  Two separate streams of air pass through a turbofan engine.  One passes through the engine core while the second bypasses the core.  The Gloster E28/39 which flew for the first time on May 15, 1941 was one of the first times a turbofan engine was used for military or commercial aircraft.



The fourth type of jet engine is known as the turboshaft.  Most of the energy produced by the expanding gases drives a shaft connected to a turbine through a single stage of reduction gearing rather than producing jet thrust.  Turboshaft engines are predominantly used by helicopters.  The first turboshaft engine was built by the French firm, Turbomeca in 1949.

Turbine engines have several advantages over reciprocating engines, including less vibration, increased aircraft performance and reliability.  In addition, each type of turbine engine has its own advantages and disadvantages. For more information about the types of turbine engines, visit www.covingtonaircraft.com.