Category Archives: Aviation

A Look at the PT6A-67AG Powered 710P Thrush A.K.A the 770 Fire Angel

In December 2017, The Aerotech Group, based in Kent Town, SA Australia, took possession of its new 710P Thrush. The purchase was made through Campbell Briggs of Statewide Aviation, Australia’s Thrush dealer, based in Moree NSW. The aircraft is powered by Pratt & Whitney Canada’s PT6A-67AG engine. This may have seemed an unusual purchase to many, as The Aerotech Group has been buying Air Tractors since the early 1980s and has been a big supporter of the brand. And it still is, currently having 12 Air Tractors in its fleet.

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Blackhawk secures Canadian Approval for King Air 350 Engine Upgrade

US engineering company and aftermarket specialist Blackhawk Modifications has received Canadian supplemental type certification for its XP67A engine upgrade on the Beechcraft King Air 350, and is preparing to begin work on the first retrofit for a local customer.

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Fashionably Late Doesn’t Apply To Your Engine TBO. Here’s Why

This article originally appeared on the P&WC Airtime Blog.

There are two simple reasons why always respecting an engine’s TBO is of fundamental importance to any operator: performance and economics. Discover why this is one deadline you don’t want to miss.

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A Brief History of the Cessna Caravan

The development and early years of a legendary aircraft.

The Cessna Caravan business turboprop aircraft seems like it’s been around forever- but surprisingly- it’s only 33 years since the first aircraft rolled off Wichita’s production line in August 1984. Now this multi-role aircraft- which operates in 68 countries around the world- has become indispensable. It was conceived at just the right time and has never looked back since that first Federal Express order. In fact, as of this writing- aircraft number 1-522 had just rolled off the Wichita production line.

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A Look at the Pratt & Whitney R-985 Wasp Junior Beechcraft D18S Twin Beech

On January 15, 1937, the Beechcraft Model 18 made its first demonstration flight at the factory in Wichita, Kansas, and it continued in production for thirty-two years. This low-wing, all-metal, twin-engine monoplane was originally intended as a six-to-eight-passenger executive or feeder airline transport. As the years passed, however, the Model 18 was adapted to many uses and, in all, thirty-two different versions were produced.

This post is from the Smithsonian National Air and Space Museum.

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4 Must-Haves For PT6A Engine Line Maintenance

This article originally appeared on the P&WC Airtime Blog.

Certain equipment is essential for keeping a PT6A engine running smoothly. Here are four tools and parts that either the aircraft owner or the operator needs to have when doing routine maintenance work.

1. FUEL NOZZLE FLOW CHECK AND PRESSURE CHECK FIXTURES

Typically, ultrasonic fuel nozzle cleaning should be carried out every 200 to 400 hours(1) of flying time, to make sure the nozzle is performing properly and there are no problems such as blockages. “Whenever you clean your fuel nozzle, you should also check it for leaks and flow irregularities like drooling, spitting, streaking or other patterns that could damage the hot section,” explains Yves Houde, PT6A Customer Manager at Pratt & Whitney Canada.

Checking for irregularities of the fuel nozzle requires the use of both a flow check fixture and a pressure check fixture. These are fitted over the nozzle to help identify tips that need to be cleaned or replaced and verify the presence of any leaks before the aircraft is returned to service. Learn more about what to check for in our article on fuel nozzle maintenance.

2. BORESCOPE KIT

Whenever undertaking fuel nozzle maintenance, make sure to perform a borescope inspection at the same time. To do this, you will need a borescope kit, including a guide tube for accessing hard-to-reach areas of the engine. Using a borescope is much easier than the old-fashioned method, which involves opening up the engine.

A borescope allows for assessment of hot section components for wear or damage that may not be evident from a regular ground power check or flight data collection. For instance, on a single power turbine engine, inserting a borescope through the exhaust duct port and power turbine stage may reveal trailing edge cracks on compressor turbine blades.

“It’s the number-one equipment you need to have for line maintenance,” says Yves. “The time when fuel nozzle cleaning is performed is an ideal moment for operators to assess the hot section’s condition with a borescope. We also advise using it to check the first-stage compressor for foreign object damage every year.”

Borescope kits are made by a number of companies. PT6A owners can check their engine’s maintenance manual for the recommended product’s part number and order it from a designated supplier.

It’s hard to generalize about PT6A engines, but there’s some equipment you can’t do without. It’s the core of the line maintenance you need to perform.

YVES HOUDE

3. OIL FILTER PULLER/PUSHER TOOL

Oil filter maintenance is recommended every 100 hours or so. When doing this procedure, use a puller/pusher to open and close the filter’s check valve. While the oil filter can be popped out by hand, it’s not a good idea to do so, since it could damage the oil filter check valve seal, which in turn could lead to static oil leak when the engine is not running.

4. TURBINE RINSE TUBE AND COMPRESSOR WASH RIG

PT6A engines may need to be washed periodically to remove salt and other impurities; how often depends on the operating environment. Whenever it’s time to clean the engine, a compressor wash rig and turbine rinse tube are essential.

Unlike other engines, most PT6A engines already have a wash ring installed around the air intake, so all you need to do is connect the compressor wash rig and insert the water. After the compressor wash, use the turbine rinse tube to clean the turbine as well.

You don’t need any special cleaning solution for a desalination wash—pure, ionized water will do. “But it’s always a good idea to test the water quality first to make sure it’s suitable for cleaning,” adds Yves. “If you use the wrong water, washing may end up causing more problems than it solves.” Have a look at our article on desalination washes for more tips on keeping your engine free of contaminants.

(1) Refer to your Engine Maintenance Manual (EMM), Periodic Inspection Fuel Nozzle Cleaning interval for the interval that applies to your engine model.

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