The PT6A-27 Pilatus PC-6 Porter: Designed to Do It All

The success of the PC-6 Porter is built around its STOL capabilities. This feature makes it very sought-after for missions such as international relief, firefighting, medevac, parachuting, search and rescue, and even sightseeing.

If you watch movies or TV at all, you’ve probably seen “the Porter” in action, taking off and landing on remote dirt airstrips in far corners of the world. That’s not just the work of Hollywood, that’s just what the Pilatus PC-6 Porter does best. The Pilatus Porter is considered one of the world’s most versatile STOL aircraft, an acronym for short takeoff and landing.

Development of the Pilatus PC-6 Porter

Pilatus Aircraft, based in Stans, Switzerland, introduced the PC-6 way back in 1959. The first PC-6/340 Porter was powered by a 340 hp Lycoming GSO-480 flat six and had a useful load of just under 2,000 pounds. It would quickly receive some minor upgrades, including an engine upgrade to a 350 hp Lycoming O-540 six-cylinder engine, increasing its max weight by 500 pounds.

Less than 70 piston Porters were built before Pilatus took the leap to turboprops, starting with the 523 shp Turbomeca Astazou IIE engine in the PC-6/A in 1961. From here on out, the Porter would undergo countless engine changes without really changing the airframe much at all. Forty PC-6/As were built, most with the Astazou IIE or IIG engines. A few were built with more powerful 573 shp Turbomeca Astazou XIIs, all in the 1960s.

The bulk of PC-6 Porters are fitted with the Pratt & Whitney PT6A variants. These PC-6/Bs came off the line in 1964 first with the 550 shp PT6A-6A. Again, only a few of these were built before Pilatus fitted the PC-6/B1 with the PT6A-20 engines, still rated at 550 shp.

Today’s most popular Porter is the PC-6/B2, introduced in 1984. The B2 model is equipped with the super-reliable PT6A-27 engine, capable of 680 shp but derated to 550 shp in the PC-6. Almost 300 of these aircraft have been built. The PC-6/B2-H2 is capable of a max takeoff weight of 4,850 lbs; the B2-H4 was designed with the same engine but a stronger airframe and wingtips added to the wings, increasing the takeoff weight significantly to 6,173 lbs.

We also have the PC-6/C. Approximately 60 of these models were built, with Garrett turboprop engines starting in the mid-1960s. These aircraft were actually produced under a license by Fairchild Industries in the United States for service in the Vietnam War and were known as the “Peacemaker”. These aircraft were fitted out with Gatling guns and external pylons and served in both the U.S. Air Force and U.S. Army as an armed STOL cargo craft. Their service in the Vietnam War was short-lived due to a myriad of problems with the non-standard configurations, so the aircraft returned home after less than a year and were eventually sold to the Royal Thai Air Force.

Photo by Pilatus Aircraft LTD

Two other Porter models were tested but quickly scrapped. Why try to improve on something that really doesn’t need to be improved? The PC-6/D was a short-lived prototype developed in the 1960s with a turbocharged 500 hp Lycoming piston engine. The second, more ambitious project was a twin. The PC-8D was built on the PC-6 airframe using 290 hp Lycoming IO-540 piston engines. Development of the Twin Porter started in 1967 but was halted in 1969. Back to the reliable single-engine Porters!

The Pilatus Porter as a (fill in the blank) Airplane

Where to start? The Pilatus Porter does it all and was designed to do so. Construction is very simple, using the standard monocoque construction with aluminum spars, ribs, and skin. There are two large sliding doors on both sides of the cabin to facilitate the transfer of cargo and medical patients. The pilot can operate an optional trapdoor for dropping supplies or material like fire retardant. The seating for ten passengers can be quickly and easily removed for cargo, including the cockpit passenger seat.

Read more at Disciples of Flight.

One thought on “The PT6A-27 Pilatus PC-6 Porter: Designed to Do It All

  1. PC-6 Porter is a short takeoff and landing light weight aircraft and it is made for various purposes like extinguishing fires, transport patient to the hospital and for searching something so on.

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