Pratt And Whitney (P&W) PT6A Gas Turbine Power - Click To Enlarge

The Power Source Behind The Vazar Dash 3 Pratt And Whitney PT6A-135A and PT6A-34 Series Turbine.

The PT6 is a turboprop aircraft engine manufactured by Pratt & Whitney Canada and is the most popular turboprop in history. It has an unusual design in that the air enters from the rear of the engine and the power section is at the front. However, it is the power section that requires the most maintenance and having it at the front makes it more accessible than burying it in an engine nacelle or the body of the aircraft.

Air enters the PT6A through a scoop at the rear of the engine, passes through a three-stage axial compressor, a single-stage radial compressor, then through the combustion chamber. The hot exhaust gases pass through a single-stage turbine which drives the engine compressor shaft, and then through a two-stage turbine which drives the propeller shaft, before exiting at the front of the engine. The PT6 is especially noted for its reliability and ease of maintenance. It is now sometimes chosen for projects simply because it is so well known and liked throughout the world.

Vazar Turbine Otters equipped with floats and the PT6A-135A turbine engine which turns 300 RPMs slower reduces prop noise by almost half according to some operators.

A cutaway of the PT6A shows the engineering mastery involved in assembly.

The Pratt and Whitney PT6 engine is the most popular and thoroughly proven power plants in its class. Success of the engine is largely attributed to its performance, versatility and dependability, low noise emission, and reverse thrust capabilities. It Is well established in the corporate, regional/commuter transport, training and utility aircraft markets.

The PT6A-135 series and PT6A-34 is a free turbine propulsion engine incorporating a multi-stage compressor turbine, and independent single stage power turbine driving the output shaft through integral planetary gearing. A single annular combustion chamber, 14 simplex fuel nozzles and two igniter plugs comprise the combustion system.

Engine dry weight (with standard equipment): 338 lbs. Output shaft speed (Max.): 190 RPM

Pratt And Whitney (P&W) PT6A Gas Turbine Power - Click To Enlarge

PT6A - Product Overview - P&W

P&W has a 30-year history in providing military helicopter power and the TwinPac® continues to set standards for military helicopter engine reliability, durability and low ownership cost. With its PT6C new technology engine, P&WC is involved in some of the most innovative programs currently under development in the helicopter industry, providing power for tilt-rotor, heavy helicopters and UH-1 re-engining. The PW200 engine delivers the latest proven technology leading to unprecedented levels of reliability and economy for the new generation of single and twin-engine helicopters and is an excellent engine for rotorcraft and tiltrotor UAVs.

Operation

Pratt And Whitney (P&W) PT6A Gas Turbine Power - Click To Enlarge

Pratt And Whitney (P&W) PT6A Gas Turbine Power - Click To Enlarge

PT6A Small
The air enters the engine through the inlet screen; it is then compressed by a multi-stage compressor and fed to the combustion chamber where it is mixed with fuel and ignited.

The hot gas expands through two turbine stages; the first drives the compressor and the accessories; the second, mechanically independent from the first, drives the propeller shaft by means of a reduction gearbox. Finally, the hot gas is discharged through the exhaust ducts.


PT6A-135A


Take-off rating
Thermo ESHP 944
Mechanical SHP 750
Shaft RPM 1900

Service Intervals
Basic HSI (HR) 1800
Basic TBO (HR) 3600
Fleetleader TBO (HR) 6100

Pratt And Whitney (P&W) PT6A Gas Turbine Power - Click To Enlarge

AA - On condition
AB - Without modular program
AC - Dependent upon S.B. standard
AD - Pending DOT approval
AE - Recommended, on-condition optional
AF - Regional airline use

The success and continued growth of our service and aftermarket activities have not come about by accident. They reflect the determined efforts of the entire P&WC family to win the confidence and goodwill of delighted customers worldwide by providing the unbeatable combination of top-quality products and superior services.

Warranty

P&WC offers a full range of engine warranties and service policies tailored to meet the needs of customers and marketplaces served by our engines.

The warranties for new engines, combined with the appropriate service policies, form a comprehensive commercial protection package for operators of P&WC engines. For complete information about the engine warranty and service policy applicable to your engine model or, for details on how to make a claim, you may contact:

Pratt And Whitney (P&W) PT6A Gas Turbine Power - Click To Enlarge

Your local P&W field service representatives
Any P&WC designated overhaul and repair facility
Warranty Administration
The P&WC Customer Help Desk

P&W - Manager - Warranty Administration :
Tel: 450-647-4102
Fax: 450-647-2831
E-Mail: warranty@pwc.ca

The Pratt & Whitney Canada PT6 Turboprop Engine Family
Web Site: www.pwc.ca

Pratt & Whitney Canada's PT6 turboprop engine family is the world's most popular engine in its class, with close to 34,000 engines produced to date. The PT6 turboprop engine family offers a power range of 550 to 2,000 shp in corporate, utility, agricultural, training and airline applications. The PT6 has established an enviable record for reliability and durability since the first engine was introduced to the market in 1964.

The PT6 continues its world-renowned heritage of leadership in the industry with new applications, such as the Raytheon King Air C90GT and the EADS Socata TBM 850. The PT6 turboprop engines are in operation in 173 countries with more than 6,200 operators. To date, the PT6 family has achieved more than 277 million operating hours. The PT6 turboprop engine operators enjoy the full backing of P&WC’s extensive Global Customer Support Network. P&WC also offers engine maintenance cost protection programs that provide a comprehensive menu of services tailored to our customers’ individual requirements.

Pratt & Whitney Canada (P&WC) is a United Technologies Corp. (NYSE: UTX) company, based in Longueuil, Quebec. P&WC is a world leader in the design, manufacture and service of aircraft engines powering business, general aviation and regional aircraft, and helicopters. The company also offers auxiliary power units and industrial gas turbines. United Technologies, based in Hartford, Conn., is a diversified company providing high technology products and services to the global aerospace and building industries.

Shawna Vaughan
Vazar - Marketing Sales 360-671-7817