Pilatus PC-6 Porter

PC-6 Porter/Turbo-Porter
A PC-6 Turbo-Porter, B2-H4 PT6A-34 variant, used for skydiving in Spain
Role STOL Passenger and utility aircraft
Manufacturer Pilatus Aircraft
Built by Fairchild Aircraft
First flight Porter - 4 May 1959
Turbo-Porter - 2 May 1961.
Status Active service, in production
Primary users Civil aviation
Austrian Air Force, Myanmar Air Force, Swiss Air Force
Produced 1959-present
Number built 581 (As of August 2014)[1]
Unit cost
$55,000 (1962)[2]
$1,900,000 (2010)[3]
Variants Fairchild AU-23 Peacemaker

The Pilatus PC-6 Porter is a single-engined Short Take-Off and Landing (STOL) utility aircraft designed by Pilatus Aircraft of Switzerland. First flown in 1959, the PC-6 continues in production at Pilatus Flugzeugwerke in Stans, Switzerland. It has been built in both piston engine and turboprop powered versions and was produced for a time by Fairchild Hiller in the United States.

Development

On 4 May 1959, the first prototype, powered by a 254 kW (340 shp) piston engine, made its maiden flight.[4] In early May 1961, the first Turbo Porter, powered by a Turbomeca Astazou II turboprop engine, performed its initial flight.[5] In comparison to its earlier piston-engine powered incarnation, the Astazou II-equipped Turbo Porter had an increased gross capacity and top speed, as well as benefitting from the engine's automatic handling functions, these benefits came at the expense of a greater initial purchase cost and higher fuel consumption.[5] Both the piston and turbine-engine versions of the PC-6 became quickly known for their Short Take-Off and Landing (STOL) capabilities, requiring only a very short takeoff run before being ready for rotation.[6]

The initial turbine-powered models of the PC-6 were equipped with the Astazou II powerplant, however complaints of the reliability of this engine were made. Another early turboprop powerplant that became available for the PC-6 was the Garrett Air Research TPE 331, some operators such as Air America chose to retrofit their Astazou II-powered PC-6s with the TPE 331 engine in its place.[7] In May 1996, the first PC-6 to be equipped with the Pratt & Whitney Canada PT6A engine performed its maiden flight.[8]

To offset rising labour and manufacturing costs in Switzerland, Pilatus distributed manufacturing work on the PC-6 to other countries; in 1993, Czech Republic-based Letov Kbely began manufacturing activity upon the type.[9] In 2013, Pilatus formed a joint venture with Beijing Tian Xing Jian Yu Science Co., Ltd. to locally manufacture the PC-6 and the newer Pilatus PC-12 in Chongqing, China; initially this facility performed sub-assembly work on the fuselage, and later other elements such as the wings and moving surfaces, which were conveyed to Pilatus' final assembly facility in Stans, Switzerland.[10][11] Global production of the PC-6 shall be eventually transferred to the Chongqing facility. On 11 December 2014, the first Chinese-assembled PC-6 fuselage was completed.[12][13] In 2014, the majority of PC-6s delivered that year were to Chinese customers.[14]

The Porter was also manufactured under license by Fairchild Hiller in the United States. Roughly 100 of these licence-produced aircraft would be completed, being mainly purchased by civil operators within the US.[15][7] A number of Fairchild Hiller-built PC-6s were also procured for military operations during the Vietnam War. It received the designation AU-23A Peacemaker for service with the U.S. Air Force and UV-20 Chiricahua for service with the U.S. Army. The Peacemaker was fitted with a side-firing 20mm XM-197 Gatling cannon, four wing pylons and a centre fuselage station for external ordnance. However, the AU-23A proved to be troublesome in service; all AU-23 were returned to the U.S. and placed into storage after only a single year of operations. In 1979, a pair of UV-20s were assigned to the aviation detachment of the Berlin Brigade in Germany due to their suitability for operating within the heavily restricted airspace; they were fitted for carrying either cargo, up to eleven passengers, or three litters with four medical attendants.[16]

Design

PC-6 cabin interior, circa 1960s

The Pilatus PC-6 Porter is a Short Take-Off and Landing (STOL) utility aircraft. The majority of aircraft are powered by a single Pratt & Whitney Canada PT6A turboprop engine, which drives a fully reversible, constant-speed, three-bladed HC-B3TN-3D (or an alternative four-bladed HC-D4N-3P unit) Hartzell aluminium propeller via a reduction gearbox.[17][18][19] Pilatus claims that it possesses unique STOL capabilities, capable of landing in places only otherwise accessible by rotorcraft.[18] It is fully capable of being operated from unprepared rough airstrips, in remote areas, hot climates and at high altitudes in all-weather conditions. In particular, the undercarriage employed provides for high wing and propeller clearances, making the PC-6 less susceptible to damage than conventional nosewheel-type undercarriages.[18] For further landing versatility, various types of landing gear may be optionally installed allowing it to operate from different types of terrain; options include floats for water landings and skis for landing on snow.[17]

Early models of the PC-6 were equipped with a full instrument panel as standard, and was reportedly easy for unfamiliar pilots to intuit.[20] Later manufactured PC-6s are equipped with a Garmin G950 glass cockpit in place of analogue instrumentation; the majority of earlier-produced PC-6s can also be retrofitted with a glass cockpit as well.[3][21] In addition to its flight functionality, the G950 system acts as a remote maintenance unit and electronic flight bag all in one. Two large 10.4-inch liquid-crystal displays (LCDs) are present, functioning as the Primary Flight Display for all key flight information and the Multi-function Display for system/mission management respectively; fully independent secondary flight instrumentation is also provided to provide backup altitude, attitude, and airspeed information in the event of complete electrical failure.[18][3] The cockpit has been designed for single pilot operations; additional flight controls for a co-pilot can be optionally fitted.[17] Other optional features include an autopilot (capable of operating within all phases of flight), traffic collision avoidance system (TCAS), terrain awareness and warning system (TAWS), weather radar, satellite phone, LIDAR, forward-looking infrared (FLIR) and lightning detector; in addition, onboard electrical and avionics equipment are readily modifiable to conform with customer requirements.[18][3]

Analogue cockpit instrumentation of a PC-6, 2007

The airframe is of a rugged and low-maintenance construction; featuring high levels of accessibility, interchangeability, and favourable manning levels.[18] The wings, fuselage, and empennage are manufactured using conventional semi-monocoque construction techniques, the primary structure being composed of aluminium;[18] the central structure retains critical strength despite the cut-out areas for the sliding doors of the main cabin.[20] Corrosion resistance is achieved via a combination of plating and a polyurethane-based enamel paint.[18] The simple nature of the structure allows for ease of repair in the field.[15] Features such as low-pressure tyres, twin-clipper disc brakes, and a highly energy-absorbent undercarriage enable the aircraft to be capable of operating from rough or otherwise challenging terrain.[22]

For role flexibility, individual aircraft can be easily converted between various mission types, such as transport, paradrop, aerial photography, surveillance, air medical services and search and rescue duties.[17][18] A maximum of ten passengers, or a 2,200 lb payload, may be carried within the aircraft's main cabin area within the rear section of the fuselage; the standard passenger seats are designed to allow for rapid removal and may be stowed within an optional separate externally accessed seat stowage compartment behind the main cabin.[18][23] The main cabin area is furnished with soundproofing measures, ventilation, and heating as standard.[20] A maximum of three fuel tanks can also be carried in the main cabin, accordingly reducing payload capacity, to increase the aircraft's flight endurance.[18] In addition to the large sliding doors at either side of the main cabin, separate hinged doors are present on either side of the cockpit; an optional pilot-controlled trap door, to accommodate supply drops or surveillance payloads, may also be installed in the center of the cabin floor without any design changes required.[17][7][24] Additional equipment include a firefighting system, aerial application system, underwing tanks, sand filters, propeller de-icing system, mudguard, tailwheel debris guard, oxygen system, and additional power distribution system.[18][15][25]

Operational history

The PC-6 is noted for its Short Take-off and Landing (STOL) performance on almost any type of terrain - it can take off within a distance of 640 feet (195 m) and land within a distance of 427 feet (130 m) while carrying a payload of 2,646 lbs (1,200 kg). Thanks to its STOL performance, the PC-6 holds the world record for highest landing by a fixed-wing aircraft, at 18,865 feet (5,750 m), on the Dhaulagiri glacier in Nepal.[26]

Due to the type's favourable STOL characteristics, described by Flying Magazine as being "one of the most helicopter-like airplanes in terms of takeoff performance", Pilatus has deliberately marketed the PC-6 towards helicopter operators at times, feeling the type to be complimentary to their typical mode of operation.[15] According to Pilatus, the PC-6 can provide very similar surveillance capabilities to a rotorcraft at a significantly lower cost to operate and procure.[9]

Peruvian Air Force PC-6, 2014

During its early service, the PC-6 Porter was noted for its high level of comfort and usability against competing aircraft.[27] The type has also proven to have a long service life; by 1993, roughly 440 of the 500 PC-6 Turbo Porters completed by that point were still in service.[15]

During the 1960s and 1970s, the Central Intelligence Agency (CIA)-controlled arline Air America operated up to 23 PC-6s at a time. Many of these were operated in the South-East Asia region, including South Vietnam during the Vietnam War. The type was used for various missions including paradropping supplies to troops, passenger transport, psy ops, reconnaissance, prisoner conveyance, airborne radio relay, and other intelligence operations.[7]

Since 1976, the Austrian Air Force has operated a fleet of 12 PC-6 Porters as the mainstay of their fixed-wing transport fleet; the type has been used in various support roles, including transport, Search and Rescue, firefighting, observation, target-towing and paradropping.[28][29]

According to Flying Magazine, around 40 per cent of all PC-6s in use in Europe during the early 1990s were being used by skydivers.[8]

Variants

A PC-6/350 Porter
PC-6/B2-H4 Turbo-Porter
A Fairchild Porter
Pilatus PC-6/ B2-H4 in flight
PC-6/340 Porter
Initial production version, powered by a 254-kW (340-hp) Lycoming GSO-480-B1A6 flat-six piston engine. Max take-off weight 1,960 kg (4,320 lb).[4]
PC-6/340-H1 Porter
As PC-6/340, but with modified landing gear and increased weight (2,016 kg (4,444 lb)).[4]
PC-6/340-H2 Porter
As for H-2, but with maximum take-off weight increased to 2,200 kg (4,850 lb).[4]
PC-6/350 Porter
As PC-6/340, but powered by a 261 kW (350 hp) Lycoming IGO-540-A1A piston engine.[4]
PC-6/350-H1 Porter
As for /340 H1 but with O-540 engine.[4]
PC-6/350-H2 Porter
As for 340 H2 with O-540 engine.[4]
PC-6/A Turbo-Porter
Initial turboprop powered version, fitted with a 390 kW (523 shp) Turbomeca Astazou IIE or IIG turboprop engine.[4]
PC-6/A1 Turbo-Porter
This 1968 version was powered by a 427-kW (573-shp) Turbomeca Astazou XII turboprop engine.
PC-6/A2 Turbo-Porter
This 1971 version was powered by a 427-kW (573-shp) Turbomeca Astazou XIVE turboprop engine.
PC-6/B Turbo-Porter
This version was powered by a 410-kW (550-shp) Pratt & Whitney Canada PT6A-6A turboprop engine.
PC-6/B1 Turbo-Porter
Similar to the PC-6/B, but fitted with a 410-kW (550-shp) Pratt & Whitney Canada PT6A-20 turboprop engine.
PC-6/B2-H2 Turbo-Porter
Fitted with a 507-kW (680-shp) Pratt & Whitney Canada PT6A-27 turboprop engine.
PC-6/B2-H4 Turbo-Porter
The B2-H4 has improved airframe structuring and extended, upturned wingtips.
PC-6/C Turbo-Porter
One prototype built by Fairchild Industries in the USA, powered by a 429-kW (575-shp) Garrett TPE331-25D turboprop engine.
PC-6/C1 Turbo-Porter
Similar to the PC-6/C, but fitted with a 429-kW (575-shp) Garrett TPE 331-1-100 turboprop engine.
PC-6/C2-H2 Porter
Developed by Fairchild Industries in the USA. It was powered by a 485-ekW (650-ehp) Garrett TPE 331-101F turboprop engine.
PC-6/D-H3 Porter
One prototype, fitted with a 373-kW (500-hp) avco Lycoming turbocharged piston engine.
AU-23A Peacemaker
Armed gunship, counter-insurgency, utility transport version for the U.S. Air Force. It was used during the Vietnam War in the early 1970s. 35 were built under licence in the USA by Fairchild Industries. All aircraft were sold to Royal Thai Air Force.
OV-12
Designation for U.S. version, cancelled 1979.
UV-20A Chiricahua
STOL utility transport version for the U.S. Army. Two UV-20As were based in West Berlin during the 1970s and 1980s.
PC-8D Twin Porter
Twin-engined version flown in 1967, but not subsequently developed.

Operators

Austrian Air Force PC-6, 2013
A Fairchild AU-23 in a steep climb
PC-6 prior to landing, 2009
A low-passing PC-6, 2009
Pilatus PC-6/B2-H2, 2010
Continental Air Service's PC-6, 2010

Current military operators

 Angola
 Argentina
 Austria
 Burma (Myanmar)
 Chad
 Ecuador
 Iran
 Mexico
 Peru
Slovenian Air Force Pilatus PC-6 L6-03 landing at the Murska Sobota Airport
 Slovenia
  Switzerland
 Thailand
 United States

Former Military operators

 Algeria
 Australia
Bophuthatswana
 Bolivia
 Colombia
 France
 Israel
   Nepal
 Oman
 South Africa
 Thailand
 Sudan
 United Arab Emirates
 United States

Law Enforcement operators

 Malaysia
 Oman
 South Africa
 Thailand

Civil operators

Continental Air Services PC-6 Porter in Laos, ca. 1970
Swissboogie PC-6/B2-H4 Turbo Porter, 2005
United States Geological Survey PC-6 Porter, 2007
PC-6 upon Franz Josef Glacier, 1999
 Australia
 Indonesia
 Mongolia
   Nepal
 New Zealand
 Papua New Guinea
 Thailand
 United States

Former civil operators

 Hungary
   Nepal

Accidents and incidents

Specifications (PC-6 B2 Turbo-Porter)

Fairchild AU-23A Peacemaker with XM197 20mm cannon

Data from Jane's All The World's Aircraft 1993–1994,[45] Pilatus Aircraft,[17][46] Flying Magazine.[47]

General characteristics

Performance

See also

External video
Documentary featuring the PC-6
STOL takeoff performed by a PC-6
PC-6 display at the 2009 Durban Virginia airshow
Related development
Aircraft of comparable role, configuration and era

References

Citations

  1. ↑ Paper Printout "Rollout PC-24" from Pilatus Flugzeugwerke AG Page 5, handed out on 01.08.2014 do the Rollout celebration of the PC-24 at Stans / Buochs Airport.
  2. ↑ Fricker 1962, p. 103.
  3. 1 2 3 4 Collins, Peter. "FLIGHT TEST: Pilatus PC-6." Flight International, 28 September 2010.
  4. 1 2 3 4 5 6 7 8 Taylor 1965, pp. 126–127.
  5. 1 2 Fricker 1962, p. 38.
  6. ↑ Fricker 1962, p. 102.
  7. 1 2 3 4 Leeker, Joe F. "Air America: Pilatus / Fairchild PC-6 Turbo Porters." University of Texas at Dallas, 24 August 2015.
  8. 1 2 Moll 1993, p. 65.
  9. 1 2 Moxon, Julian. "Small is beautiful." Flight International, 12 June 1996.
  10. ↑ Spruce, Terry. "Pilatus forms joint venture and opens new facility in China." Corporate Jet Investor, 7 August 2013.
  11. ↑ "Pilatus Bets On PC-6 Porter for China." Aviation Week, 11 November 2014.
  12. ↑ "Swiss PC-6 aircraft fuselage tapes out." China Daily, 18 December 2014.
  13. ↑ "Pilatus PC-6 Airplanes." China Daily, 7 January 2014.
  14. ↑ Trautvetter, Chad. "Pilatus Tops $1B in Revenues for Second Year in a Row." AIN Online, 9 April 2015.
  15. 1 2 3 4 5 Moll 1993, p. 64.
  16. ↑ Johnson and Jones 2013, pp. 433.
  17. 1 2 3 4 5 6 "PC-6: The World's Leading STOL." Pilatus Aircraft, Retrieved: 17 March 2016.
  18. 1 2 3 4 5 6 7 8 9 10 11 12 "PV-6 Turbo Porter: Anywhere, Anytime, in any Environment." Pilatus Aircraft, Retrieved: 19 March 2016.
  19. ↑ "Datalink." Flying Magazine, November 2002. p. 50. Vol. 129, No. 11. ISSN 0015-4806.
  20. 1 2 3 Fricker 1962, p. 101.
  21. ↑ "Cockpit." Pilatus Aircraft, Retrieved: 20 March 2016.
  22. ↑ "Operational Area." Pilatus Aircraft, Retrieved: 20 March 2016.
  23. ↑ "Cabin." Pilatus Aircraft, Retrieved: 20 March 2016.
  24. ↑ "Porter in England." Flight International, 1 January 1960. p. 13.
  25. ↑ "Special Missions." Pilatus Aircraft, Retrieved: 20 March 2016.
  26. ↑ Isserman, Weaver and Molenaar 2008, p. 358.
  27. ↑ Fricker 1962, pp. 100-101.
  28. ↑ Moxon, Julian. "Austria ready to modernise." Flight International, 27 October 1999.
  29. ↑ "The Austrian Air Force - In the Past and Today." Austrian Armed Forces, Retrieved: 20 March 2016.
  30. ↑ Hoyle Flight International 8–14 December 2015, p. 32.
  31. ↑ Hoyle Flight International 8–14 December 2015, p. 33.
  32. 1 2 Hoyle Flight International 8–14 December 2015, p. 43.
  33. ↑ Hoyle Flight International 13–19 December 2011, p. 36.
  34. ↑ Hoyle Flight International 13–19 December 2011, p. 37.
  35. ↑ Hoyle Flight International 8–14 December 2015, p. 40.
  36. ↑ Hoyle Flight International 8–14 December 2015, p. 45.
  37. ↑ Hoyle Flight International 8–14 December 2015, p. 47.
  38. ↑ Hoyle Flight International 8–14 December 2015, p. 49.
  39. ↑ Hoyle Flight International 13–19 December 2011, p. 49.
  40. ↑ Hoyle Flight International 8–14 December 2015, p. 52.
  41. ↑ Aviation Safety Network #30298
  42. ↑ Aviation Safety Network #20232
  43. ↑ Pilatus PC-6 Porter S/N 710 history
  44. ↑ ASN Wikibase Occurrence # 161542
  45. ↑ Lambert 1993, pp. 358–359.
  46. ↑ "Performance & Specs." Pilatus Aircraft, Retrieved: 20 March 2016.
  47. ↑ Moll 1993, p. 68.
  48. ↑ Taylor 1999, p. 489.

Bibliography

  • Fricker, John. "Pilot Report: Pilatus". Flying Magazine, Vol. 70, No. 4. April 1962. ISSN 0015-4806. pp. 38, 100-103.
  • Hoyle, Craig. "World Air Forces Directory". Flight International, Vol. 180, No. 5321, 13–19 December 2011. pp. 26–52. ISSN 0015-3710.
  • Hoyle, Craig. "World Air Forces Directory". Flight International, Vol. 180, No. 5517, 8–14 December 2015. pp. 26–53. ISSN 0015-3710.
  • Isserman, Maurice., Stewart Angas Weaver and Dee Molenaar. Fallen Giants: A History of Himalayan Mountaineering from the Age of Empire to the Age of Extremes. Yale University Press, 2008. ISBN 0-3001-4266-8.
  • Johnson, E.R. and Lloyd S. Jones. American Military Transport Aircraft Since 1925. McFarland, 2013. ISBN 1-4766-0155-0.
  • Lambert, Mark. Jane's All The World's Aircraft 1993–1994. Coulsdon, UK: Jane's Data Division, 1993. ISBN 0-7106-1066-1.
  • Moll, Nigel. "Ugly is Only Skin-Deep." Flying Magazine, Vol. 120, No. 2. February 1993. ISSN 0015-4806. pp. 62-68.
  • Taylor, John W. R. Janes's All The World's Aircraft 1965–66. London: Sampson Low, Marston & Company, 1965.
  • Taylor, Michael J. H. Brassey's World Aircraft & Systems Directory 1999/2000 Edition. London: Brassey's, 1999. ISBN 1-85753-245-7.

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