The PZL M28 Skytruck is a Polish
STOL
A short takeoff and landing (STOL) aircraft is a conventional fixed-wing aircraft that has short runway requirements for takeoff and landing. Many STOL-designed aircraft also feature various arrangements for use on airstrips with harsh condi ...
light cargo and passenger plane, produced by
PZL Mielec, as a development of licence-built
Antonov An-28
The Antonov An-28 (NATO reporting name Cash) is a twin-engined light turboprop transport aircraft, developed from the Antonov An-14M. It was the winner of a competition against the Beriev Be-30, for use by Aeroflot as a short-range airliner. It ...
s. Early licence-built planes were designated PZL An-28. The maritime patrol and reconnaissance variants are named PZL M28B Bryza ("sea breeze").
Development
![PZL-Mielec An-28, Chaika Avia Company AN1414321](https://upload.wikimedia.org/wikipedia/commons/5/58/PZL-Mielec_An-28%2C_Chaika_Avia_Company_AN1414321.jpg)
The
Antonov An-28
The Antonov An-28 (NATO reporting name Cash) is a twin-engined light turboprop transport aircraft, developed from the Antonov An-14M. It was the winner of a competition against the Beriev Be-30, for use by Aeroflot as a short-range airliner. It ...
was the winner of a competition against the
Beriev Be-30 for a new light passenger and utility transport for
Aeroflot
PJSC AeroflotRussian Airlines (russian: ПАО "Аэрофло́т — Росси́йские авиали́нии", ), commonly known as Aeroflot ( or ; russian: Аэрофлот, , ), is the flag carrier and the largest airline of Russia. The ...
's short haul routes, conceived to replace the highly successful
An-2
The Antonov An-2 ("kukuruznik"—corn crop duster; USAF/DoD reporting name Type 22, NATO reporting name Colt) is a Soviet mass-produced single-engine biplane utility/agricultural aircraft designed and manufactured by the Antonov Design Burea ...
biplane. The An-28 is derived from the earlier
An-14. Commonalities with the An-14 include a high wing layout, twin fins and rudders, but it differs in having a reworked and longer fuselage, with
turboprop
A turboprop is a turbine engine that drives an aircraft propeller.
A turboprop consists of an intake, reduction gearbox, compressor, combustor, turbine, and a propelling nozzle. Air enters the intake and is compressed by the compressor. ...
engines. The original powerplant was the TVD-850, but production versions are powered by the more powerful TVD-10B, with three-blade propellers.
The An-28 made its first flight as the An-14M in September 1969 in the USSR. A subsequent preproduction aircraft first flew in April 1975. Production of the An-28 was then transferred to Poland's PZL Mielec in 1978, although it was not until 22 July 1984 that the first Polish-built production aircraft flew. The An-28's Soviet type certificate was awarded in April 1986.
PZL Mielec has become the sole source for production An-28s. The basic variant, not differing from the Soviet one, was designated PZL An-28 and was powered with PZL-10S (licence-built TVD-10B) engines. They were built mostly for the
USSR
The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nati ...
, until it broke up. The plane was next developed by the PZL Mielec into a westernised version powered by 820 kW (1100shp)
Pratt & Whitney PT6A-65B turboprops with five-blade
Hartzell propellers, plus some western (BendixKing) avionics (a distinguishing feature are exhaust pipes, sticking out on sides of engine
nacelle
A nacelle ( ) is a "streamlined body, sized according to what it contains", such as an engine, fuel, or equipment on an aircraft. When attached by a pylon entirely outside the airframe, it is sometimes called a pod, in which case it is attache ...
s). Designated the PZL M28 Skytruck, the first flight was on 24 July 1993 and it is in limited production, mostly for export (39 produced by 2006). The type received Polish certification in March 1996, and US
FAR Part 23 certificate on 19 March 2004.
Apart from the Skytruck, PZL Mielec developed a family of militarized light transport and maritime reconnaissance planes for the Polish Air Force and Polish Navy in the 1990s, with original PZL-10S engines, named PZL M28B in the Air Force and Bryza in the Navy. From 2000, newly produced M28Bs started to be equipped with five-blade propellers as well.
PZL Mielec was bought by
Sikorsky in 2007. Purchased primarily to produce
helicopter
A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attribu ...
structures, the company also produces 10 M28s per year.
[ Sikorsky's current owner, ]Lockheed Martin
The Lockheed Martin Corporation is an American aerospace, arms, defense, information security, and technology corporation with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It ...
, has marketed it to the governments of Indonesia
Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...
, Jordan
Jordan ( ar, الأردن; tr. ' ), officially the Hashemite Kingdom of Jordan,; tr. ' is a country in Western Asia. It is situated at the crossroads of Asia, Africa, and Europe, within the Levant region, on the East Bank of the Jordan Rive ...
, Poland
Poland, officially the Republic of Poland, is a country in Central Europe. It is divided into 16 administrative provinces called voivodeships, covering an area of . Poland has a population of over 38 million and is the fifth-most populous ...
, Venezuela
Venezuela (; ), officially the Bolivarian Republic of Venezuela ( es, link=no, República Bolivariana de Venezuela), is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in th ...
, Vietnam
Vietnam or Viet Nam ( vi, Việt Nam, ), officially the Socialist Republic of Vietnam,., group="n" is a country in Southeast Asia, at the eastern edge of mainland Southeast Asia, with an area of and population of 96 million, making i ...
, the U.S.
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
and commercial operators. Split equally between commercial and military applications, it competes with the Viking Air Twin Otter
The de Havilland Canada DHC-6 Twin Otter is a Canadian STOL (Short Takeoff and Landing) utility aircraft developed by de Havilland Canada, which produced the aircraft from 1965 to 1988; Viking Air purchased the type certificate, then restarted ...
, the Let 410
The Let L-410 Turbolet is a twin-engine short-range transport aircraft, manufactured by the Czech aircraft manufacturer Let Kunovice (named Aircraft Industries since 2005), often used as an airliner. The aircraft is capable of landing on short an ...
and the Dornier 228
The Dornier 228 is a twin-turboprop STOL utility aircraft, designed and first manufactured by Dornier GmbH (later DASA Dornier, Fairchild-Dornier) from 1981 until 1998. Two hundred and forty-five were built in Oberpfaffenhofen, Germany. In 19 ...
.[
]
Design
The M28 is a twin-engined high-wing strutted monoplane
A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes.
A monoplane has inherently the highest efficiency and lowest drag of any wing confi ...
with an all-metal airframe
The mechanical structure of an aircraft is known as the airframe. This structure is typically considered to include the fuselage, undercarriage, empennage and wings, and excludes the propulsion system.
Airframe design is a field of aerospa ...
, twin vertical fins and a tricycle fixed landing gear
Landing gear is the undercarriage of an aircraft or spacecraft that is used for takeoff or landing. For aircraft it is generally needed for both. It was also formerly called ''alighting gear'' by some manufacturers, such as the Glenn L. Martin ...
.
If an engine fails, a spoiler
Spoiler is a security vulnerability on modern computer central processing units that use speculative execution. It exploits side-effects of speculative execution to improve the efficiency of Rowhammer and other related memory and cache attacks. Ac ...
forward of the aileron
An aileron (French for "little wing" or "fin") is a hinged flight control surface usually forming part of the trailing edge of each wing of a fixed-wing aircraft. Ailerons are used in pairs to control the aircraft in roll (or movement around ...
opens automatically on the opposite wing.
This limits the wing drop to 12° in five seconds instead of 30°.
It is capable of Short takeoff & landing (STOL
A short takeoff and landing (STOL) aircraft is a conventional fixed-wing aircraft that has short runway requirements for takeoff and landing. Many STOL-designed aircraft also feature various arrangements for use on airstrips with harsh condi ...
) and hot and high
In aviation, hot and high is a condition of low air density due to high ambient temperature and high airport elevation. Air density decreases with increasing temperature and altitude. The lower air density reduces the power output from the airc ...
altitude operations.[
Aerodynamically deployed ]leading edge slats
Slats are aerodynamic surfaces on the leading edge of the wing of a fixed-wing aircraft which, when deployed, allow the wing to operate at a higher angle of attack. A higher coefficient of lift is produced as a result of angle of attack and speed, ...
when approaching stall speed enable a low stall speed and while the certification landing field is , PZL has demonstrated landing in .[
Inlet air ducts inertial separators and inverted configuration of the ]PT6
The Pratt & Whitney Canada PT6 is a turboprop aircraft engine produced by Pratt & Whitney Canada.
Its design was started in 1958, it first ran in February 1960, first flew on 30 May 1961, entered service in 1964 and has been continuously up ...
and the high wing
A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes.
A monoplane has inherently the highest efficiency and lowest drag of any wing confi ...
configuration protect the engines and propellers against foreign object damage
In aviation and aerospace, foreign object debris (FOD), is any particle or substance, alien to an aircraft or system, which could potentially cause damage.
External FOD hazards include bird strikes, hail, ice, sandstorms, ash-clouds or obje ...
for unprepared runways operations.
Multiple configurations are available: a 19-passenger airliner
An airliner is a type of aircraft for transporting passengers and air cargo. Such aircraft are most often operated by airlines. Although the definition of an airliner can vary from country to country, an airliner is typically defined as an ...
with 2-1 seating and an underbelly luggage pod; a cargo aircraft
A cargo aircraft (also known as freight aircraft, freighter, airlifter or cargo jet) is a fixed-wing aircraft that is designed or converted for the carriage of air cargo, cargo rather than passenger aircraft, passengers. Such aircraft usually ...
with a hand-cranked hoist option; the most common combi; a VIP
A very important person or personage (VIP or V.I.P.) is a person who is accorded special privileges due to their high social status, influence or importance. The term was not common until sometime after World War 2 by RAF pilots.
Examples inc ...
transport; a medevac
Medical evacuation, often shortened to medevac or medivac, is the timely and efficient movement and en route care provided by medical personnel to wounded being evacuated from a battlefield, to injured patients being evacuated from the scene of a ...
for six litters and seven seats; a search-and-rescue version; a 17-seat paratrooper
A paratrooper is a military parachutist—someone trained to parachute into a military operation, and usually functioning as part of an airborne force. Military parachutists (troops) and parachutes were first used on a large scale during World ...
drop version; an 18-passenger utility cabin and an aerial firefighting
Aerial may refer to:
Music
* ''Aerial'' (album), by Kate Bush
* ''Aerials'' (song), from the album ''Toxicity'' by System of a Down
Bands
*Aerial (Canadian band)
* Aerial (Scottish band)
* Aerial (Swedish band)
Performance art
* Aerial sil ...
version is considered.[ A crew of two can switch between passenger and cargo configurations in 7 min.][ Its inward opening rear doors allow for cargo drops and utility operations as well as the passenger boarding.][
It can take off in at the ]MTOW
The maximum takeoff weight (MTOW) or maximum gross takeoff weight (MGTOW) or maximum takeoff mass (MTOM) of an aircraft is the maximum weight at which the pilot is allowed to attempt to take off, due to structural or other limits. The analogous ...
.[
Maximum ]payload
Payload is the object or the entity which is being carried by an aircraft or launch vehicle. Sometimes payload also refers to the carrying capacity of an aircraft or launch vehicle, usually measured in terms of weight. Depending on the nature of ...
is , it can carry over or with full fuel over .
Operational history
176 An-28s and M28s in all variants were built in Poland by 2006. Most numerous users are former Soviet civil aviation and the Polish Air Force and Navy (about 25 as of 2006), smaller numbers are used by the Polish civil aviation and in the United States, Nepal, Colombia, Venezuela, Vietnam and Indonesia.
On 4 November 2005, a Vietnamese Airforce M28 crashed in Gia Lam district, Hanoi. All three crewmembers were killed.
On 12 February 2009, The weekly periodical ''Air Force Times'' reported that the Air Force Special Operations Command
Air Force Special Operations Command (AFSOC), headquartered at Hurlburt Field, Florida, is the special operations component of the United States Air Force. An Air Force major command (MAJCOM), AFSOC is also the U.S. Air Force component command ...
(AFSOC
Air Force Special Operations Command (AFSOC), headquartered at Hurlburt Field, Florida, is the special operations component of the United States Air Force. An Air Force major command (MAJCOM), AFSOC is also the U.S. Air Force component command ...
) would receive 10 PZL M28 Skytrucks in June 2009. These aircraft carry the U.S. Air Force
The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...
model design series (MDS) designation of C-145A Skytruck. In 2011 one aircraft crash landed in Afghanistan
Afghanistan, officially the Islamic Emirate of Afghanistan,; prs, امارت اسلامی افغانستان is a landlocked country located at the crossroads of Central Asia and South Asia. Referred to as the Heart of Asia, it is bordere ...
and was damaged beyond repair. 11 of AFSOC's C-145As were retired in 2015. In 2016, three were sent to Kenya, two to Costa Rica, two to Nepal, and two to Estonia.
Variants
Airframe variants
;PZL An-28
:Original variant, built under Antonov
Antonov State Enterprise ( uk, Державне підприємство «Антонов»), formerly the Aeronautical Scientific-Technical Complex named after Antonov (Antonov ASTC) ( uk, Авіаційний науково-технічни ...
licence, with PZL-10S (licensed TV-10B) engines.
;PZL M28 Skytruck
:Development variant with redesigned fuselage and wings, new Pratt & Whitney Canada
Pratt & Whitney Canada (PWC or P&WC) is a Canada-based aircraft engine manufacturer. PWC's headquarters are in Longueuil, Quebec, just outside Montreal. It is a division of the larger US-based Pratt & Whitney (P&W), itself a business unit of ...
engines, new (western) avionics, 5-blade rotors, and some other minor changes.
;PZL M28B Bryza
:Militarized variants used by Polish Air Force and Polish Navy, similar to Skytruck, but with PZL-10S engines. Uses partially retracting landing gear to avoid interfering with its radar.
;PZL M28+ Skytruck Plus
:Prototype of new lengthened variant with more internal space, not in production.
;C-145A
:Variant flown by USAF Special Operations Warfare Center. Similar to Skytruck, but with Pratt and Whitney PT6A-65B Turboprops. The USAF has started retiring the aircraft, with the first aircraft, AF Ser. No. 08-0310, delivered to the at Davis-Monthan AFB, Arizona on 28 May 2015. By June 2015 eleven out of 16 aircraft were stored.
;MC-145B Wily Coyote
:In May 2021, the U.S. Special Operations Command (SOCOM) awarded a contract to Sierra Nevada Corporation (SNC) to demonstrate the MC-145B as part of the Armed Overwatch
The Armed Overwatch program is an effort launched by U.S. Special Operations Command to purchase roughly 75 crewed, fixed-wing aircraft to perform close air support, precision strike, and ISR missions.https://beta.sam.gov/opp/3de1f580d51b44acaa ...
program, which is seeking to acquire a new manned light attack aircraft to support U.S. special operations forces in permissive environments. Renderings of the proposed aircraft depict a pair of sensor turrets (one under the nose and the other under the fuselage) as well as a pair of underwing hardpoints on each side (total four) outboard of the wing struts. Internally, eight reloadable Common Launch Tubes (CLT) are provided as well as a ramp-launch capability.
Variants in use by Polish military
;PZL An-28TD
:Basic transport variant. Used mainly for transport and paratroop training (2 built).
;PZL M28B
:Several similar improved transport variants featuring avionics and airframe upgrades: Bryza 1TD (2 built), M28B (3 built), M28B Salon (1 built), M28B TDII, TDIII and TDIV (2 built of each).
;PZL M28B Bryza 1R
:Maritime patrol and reconnaissance variant (equipped with: 360° Search and Surveillance Radar ASR-400, Link-11
TADIL-A/Link 11 is a secure half-duplex tactical data link used by NATO to exchange digital data. It was originally developed by a joint committee including members from the Canadian Navy, US Navy and Royal Navy to pass accurate targeting inform ...
datalink). Used mainly for sea border patrolling, search and rescue operations and protection of the national economical sea zone (7 built).
;PZL M28B Bryza 1E skydiving
:Maritime ecological reconnaissance and patrol variant (2 built).
;PZL M28B Bryza 1RM bis
:Maritime patrol and reconnaissance variant with submarine
A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term is also sometimes used historically or colloquially to refer to remotely op ...
detection capability, of 2004 (equipped with: 360° Search and Surveillance Radar ARS-800-2, ejection of single-use hydro-acoustic sonobuoys, Thermal Imaging System (FLIR
Forward-looking infrared (FLIR) cameras, typically used on military and civilian aircraft, use a thermographic camera that senses infrared radiation.
The sensors installed in forward-looking infrared cameras, as well as those of other thermal ...
), magnetic anomaly detector, Link-11 datalink). Used mainly for sea border patrolling, search and rescue operations and protection of the national economical sea zone (1 built as of 2006).
;PZL M28 05 Skytruck
:Maritime patrol and SAR variant for the Polish Border Guard
The Polish Border Guard ( pl, Straż Graniczna, also abbreviated as SG) is a state security agency tasked with patrolling the Polish border. It existed in the Second Republic era from 1928 to 1939 and was reestablished in the modern-day Thi ...
, of 2006 (equipped with Search and Surveillance Radar ARS-400M and FLIR
Forward-looking infrared (FLIR) cameras, typically used on military and civilian aircraft, use a thermographic camera that senses infrared radiation.
The sensors installed in forward-looking infrared cameras, as well as those of other thermal ...
system) (1 built as of 2006).
Operators
Civil operators
;
*PD Sicherheit, German defense training contractor, received three aircraft in 2019.
;
* JAGS Aviation Guyana operates one aircraft.
;
*Indonesian National Police
''
, mottotranslated = (Serving the Nation)
, formed =
, preceding1 =
, dissolved =
, superseding =
, employees = 440,000 (2020)
, volunteers =
, budget =
, nongovernment ...
operates four aircraft.
;
*Sierra Nevada Corporation
Sierra Nevada Corporation (SNC) is an American, privately held aerospace and national security contractor specializing in aircraft modification and integration, space components and systems, and related technology products for cybersecurity and ...
operates two aircraft.
*Arizona Department of Public Safety
The Arizona Department of Public Safety (AZDPS) is a state-level law enforcement agency with a primary function of patrolling and enforcing state laws on Arizona highways. Director Heston Silbert was promoted from Deputy Director to Director in ...
operates two aircraft.
Military operators
Accidents and incidents
* On 28 October 2010, an Indonesian Police-operated M28 crashed in the Nabire
Nabire is a town in the Indonesian province of Central Papua, at the western end of New Guinea. The town is the administrative seat of the Nabire Regency, and has been designated to be the administrative capital of the new province. It is served by ...
region of the Indonesian state of Papua, killing five people.
* On 3 December 2016, a PZL Skytruck belonging to the Indonesian National Police crashed
"Crashed" is the third U.S. rock Single (music), single, (the fifth overall), from the band Daughtry (band), Daughtry's debut album. It was released only to U.S. rock stations on September 5, 2007. Upon its release the song got adds at those stat ...
into the ocean in Dabo, Riau Islands while carrying 13 people. All 13 people on board were killed in the accident. Eyewitnesses stated that the aircraft had suffered an in-flight failure and claimed that the engine of the plane was emitting black smoke.
* On 30 May 2017, a PZL Skytruck belonging to the Nepal Army with registration NA-048 crashed at Bajura-based Kolti airport while its pilot was trying to land the aircraft. The cargo airplane was supposed to land on the Simikot airport in Humla district. However, bad weather condition forced the pilot to divert towards Bajura. The pilot of the aircraft died while two others were injured.
Specifications (PZL M28)
See also
References
External links
PZL M28 aircraft dedicated website
List of all PZL M28 aircraft used by Polish Air Force
An-28/M28/M28B production list
{{USAF transports
1980s Polish military utility aircraft
Poland–Soviet Union relations
M28
Aircraft first flown in 1984
STOL aircraft
High-wing aircraft
Twin-turboprop tractor aircraft
Twin-tail aircraft