Radial Engine Time Between Overhaul: What’s My TBO for the R-985 & R-1340?

 

Please allow me to offer some information in regard to Pratt & Whitney R-1340 & R-985 engine Time Before Overhaul intervals (TBO’s) for engines utilized on current agricultural aircraft. A letter from Pratt & Whitney (P&W) faxed to the Federal Aviation Administration (F.A.A.) dated February 13, 1990 is useful in understanding the organization’s corporate position on the radial engine.

AT-302
Ayres AT-301 Air Tractors VH-ODB and VH-ODM at Tintinara SA in May 1989
Designed by Leland P. Snow, the AT-302 designation indicates 320 gallon hopper and P&W R-1340 radial engine
From http://www.goodall.com.au/photographs/aerial-agriculture-80-1/80saerialag-1.html

“Pratt & Whitney have no company or F.A.A approved methods for providing any engineering substantiation or manual/publication revision relating to new methods or procedures which are being accomplished by operators and overhaul shops on Pratt & Whitney reciprocating engines.”

This letter establishes a, “hands off” attitude on P&W’s part concerning the Reciprocating Radial engines. Oil consumption is a major issue and is addressed in a cautionary statement constituting part of the P&W TBO considerations given in the R-1340 & R-985 overhaul manual (part number 123440).

“Oil consumption is usually one of the best indications as to whether or not the engine requires overhaul, provided the engine is performing normally and there is no indication of possible trouble or irregularities requiring more than normal line maintenance attention. A sudden increase of oil consumption or a gradual increase of oil consumption to double that which has previously been average, is usually case for overhaul.”

The engine’s primary accessories (Carburetor, Fuel pump, Magnetos, Starter, Propeller Governor, and Generator) are designed to run to engine TBO. It is our recommendation that they be overhauled at the same TSO as the engine. Ref: AC65-12A Chapter 10 Page 411 Par. Major Overhaul Our basic TBO recommendations are 1000 to 1400 hours operating time since overhaul. In order to determine this “recommended” Time Before Overhaul we have taken into consideration all forms of Agricultural utilization of the R-1340 & R-985 engine and have averaged the operating time between overhauls of engines submitted to us for overhaul over the last 25 years.

Weatherly 620A VH-WEA
Manufactuered in 1989, Weatherly 620A VH-WEA is powered by a 9-cylinder, Pratt & Whitney R-985 radial engine however the aircraft itself has a relatively low spraying capacity of 1200 litres. From http://airqueensland.blogspot.com/2015/01/r-mach-aviation_7.html

It must be noted that there is an Airworthiness Directive 68-09-01 issued to the R-985 engine. It is concerning Crankshaft flyweights and flyweight liner replacement. This AD mandates that it be accomplished at 1200 or 1600 hrs depending on propeller installation. In order to accomplish this, the engine must be disassembled to the point it is more economically feasible to overhaul than to limit to repair and replacement only. This Time Before Overhaul recommendation is made with the assumption that all manufacturers’ recommended/required periodic inspections are complied with in a timely manner throughout the life of the engine. This recommendation is not to certify or guarantee that an operator will achieve a specific number of hours operation time before an overhaul is necessary. This TBO recommendation should in no way be considered a maximum TBO limit as it is possible to safely operate an R-1340 & R-985 past 1200 or 1400 hours TSO. It is merely a RECOMMENDATION that, hopefully, will better enable an operator to develop a safe, economic engine overhaul schedule.

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Daher’s Kodiak 100 delivery to Héli-Béarn marks the first French customer for this turboprop-powered utility aircraft

Tarbes, France, January 21, 2021 – The delivery of a Kodiak 100 to Héli-Béarn makes this air services company the first French customer for the utility aircraft member of Daher’s single-engine turboprop-powered airplane product line.

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Jet Speed with Turboprop Efficiency: The Epic E1000

The Epic E1000 is drawing attention for its sleek carbon-fiber design and intelligent engineering, producing the fastest turboprop available. Emerging from roughly a decade of perfecting its kit-plane predecessor (The Epic LT Dynasty), the E1000 promises to build on the devoted following growing around Epic Aircraft with exhilarating speed, fuel efficiency, and plenty of space. 

epic e 1000
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Tracking Starts And Flights: Understanding Abbreviated Cycles and Full Cycles for PT6 Engine Maintenance

As most of you know, there are life-limited components in a PT6. These components include the CT and PT Disks and the Compressor Disks. After a certain number of cycles they must be replaced.

starts and flights pt6a compressor disk

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PT6 turboprop engine makes General Aviation history: 50,000th engine rolls off the Pratt & Whitney Production Line

LONGUEUIL, QUEBEC, December 2, 2020 – Pratt & Whitney, a division of Raytheon Technologies Corp. (NYSE: RTX), today announced that the 50,000th PT6 turboprop engine has rolled off the production line achieving an exceptional milestone in General Aviation. With the new PT6 E-Series™ engine now in full production, powering the Pilatus PC-12 NGX, the numbers continue to grow.

“From the first application more than 50 years ago, the now-iconic PT6 engine turns possibilities into realities for our customers around the world on more than 130 different applications today,” said Irene Makris, vice president, sales and marketing at Pratt & Whitney. “With each new model of engine developed and designed for a mission, platform, and customer in mind, our employees continue to build a more efficient, smarter engine with a shrinking environmental footprint– and they continue to rise to the challenge every day.”

The PT6 turboprop engine is the proven choice for demanding, high-cycle/high-power applications in single- and twin-engine aircraft for all kinds of missions and applications. The engine fleet’s current flying population is more than 25,000 units and it has accumulated more than 410 million flight hours and counting–that’s more flying time than anyone else in this segment.

Makris sees the 50,000-engine marker as the opportunity to pause and thank customers and employees for this remarkable accomplishment. It is a testament to the ongoing success of the engine and the innovation behind its ongoing evolution. The most recent example of this being the launch of the PT6 E-Series™ engine, the first the first turbine engine in the general aviation market to offer a dual-channel integrated electronic propeller and engine control.

“This production milestone is unmatched in the industry. It offers us another opportunity to celebrate the engine’s ongoing success as we continue exploring new horizons for even more flying possibilities,” Makris said. “The achievement sits as the collective cornerstone of Pratt & Whitney in General Aviation. With the PT6 E-Series™ engine now at the forefront, we remain committed to pushing innovation as we’ve been doing since the very beginning.”

The PT6 ran for the first time in 1960, entering service in 1964. Pratt & Whitney currently offers more than 70 PT6A models, ranging from 500 SHP to over 1,900 SHP. The PT6 E-Series, the latest addition to the PT6 line, was launched in October 2019 and powers the Pilatus PC-12NGX.

About Pratt & Whitney

Pratt & Whitney, a unit of Raytheon Technologies (NYSE:RTX) is a world leader in the design, manufacture and service of aircraft and helicopter engines, and auxiliary power units. Raytheon Technologies Corporation is an aerospace and defense company that provides advanced systems and services for commercial, military and government customers worldwide. To learn more about RTX, visit its website at www.rtx.com. To receive press releases and other news directly, please sign up here.For further information: Pratt & Whitney, +1 (860) 565-9600, media@prattwhitney.com

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The History of the P&W R-1340 Powered T-6 Texan

The North American Aviation T-6 Texan two-place advanced trainer was the classroom for most of the Allied pilots who flew in World War II. Called the SNJ by the Navy and the Harvard by the British Royal Air Force, the advanced trainer AT-6 was designed as a transition trainer between basic trainers and first-line tactical aircraft. It was redesignated T-6 in 1948.

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The R-985 Powered de Havilland Beaver: Arguably the Best Bush Plane Ever Built

With a big, nine-cylinder Pratt & Whitney strapped to the front, this 5,100-pound workhorse boasts a useful load of around 2,000 pounds, and it’s built to operate out of short and rough airstrips.

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