Aero L-39 Albatros

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L-39 Albatros

An L-39 at the Santa Rosa Airshow.
Type Military trainer aircraft
Manufacturer Aero Vodochody
Maiden flight 4 November 1968
Introduced 1971
Status 2,800 still in use in various air forces
Primary users Soviet Air Force
Czechoslovak Air Force
Royal Thai Air Force
Produced 1970s-1999
Unit cost US$200,000-300,000
Developed from Aero L-29 Delfín
Variants Aero L-59 Super Albatros
Aero L-159 Alca

The Aero L-39 Albatros is a high-performance, jet trainer aircraft developed in Czechoslovakia to meet requirements for a "C-39" (C for Cvičný - trainer) during the 1960s to replace the L-29 Delfín. It was the first of the second-generation jet trainers, and the very first turbofan-powered trainer produced, and was later updated as the L-59 Super Albatros and as the L-139. The design is still produced in an evolved state as the L-159 Alca, while more than 2,800 L-39s still serve with over 30 air forces around the world. The Albatros is versatile, seeing duty in light attack missions as well as basic and advanced pilot training, and is the most widely-used jet trainer in the world.

Contents

[edit] Design and development

The L-39 first flew on 4 November, 1968. The L39 Albatros is a widely flown trainer/light attack aircraft similar in mission to the Italian MB339. The design is Czechoslovak, though there was significant Soviet input. The aircraft is in service with various former Soviet allies.

The low, slightly swept wing has a double-taper planform, 2 1/2-deg dihedral from the roots, a relatively low aspect ratio, and permanently attached, 26 1/2-gal US (100-liter) wingtip tanks. The trailing edge has double-slotted trailing edge flaps inboard of mass-balanced ailerons; the flaps are separated from the ailerons by small wing fences.

The tall, swept vertical tail has an inset rudder. Variable-incidence horizontal stabilizers with inset elevators are mounted at the base of the rudder and over the exhaust nozzle. Side-by-side airbrakes are located under the fuselage ahead of the wing's leading edge. Flaps, landing gear, wheel brakes and air brakes are powered by a hydraulic system. Controls are pushrod-actuated and have electrically powered servo tabs on the ailerons and rudder. Operational g-limits at 9,259 lb (4,200 kg) are +8/-4 g.

A single turbofan engine is embedded in the fuselage and is fed through shoulder-mounted, semi-circular air intakes (fitted with splitter plates) just behind the cockpit; the engine exhausts below the tailplane. Five rubber bag fuel tanks are located in the fuselage behind the cockpit. The main, trailing-arm landing gear legs retract inward into wing bays; the nose gear retracts forward.

A long, pointed nose made of fiberglass leads back to the tandem cockpit, in which the student and instructor sit under individual canopies that are hinged on the right. The rear (instructor's) seat is raised slightly; both ejection seats are made by Aero.

The basic trainer is not armed, but has two underwing pylons for drop tanks and practice weapons. Light-attack variants have four underwing hardpoints for ground attack stores; the ZA also has an underfuselage gun pod.

This model is no longer in production and is replaced by the L-159.

[edit] Operational history

Civil L-39 in fictional Soviet 84th Light Strike Squadron markings
Civil L-39 in fictional Soviet 84th Light Strike Squadron markings
Royal Thai Air Force L-39ZA/ART in flight during SAREX 2007 at Wing41 Chiang Mai
Royal Thai Air Force L-39ZA/ART in flight during SAREX 2007 at Wing41 Chiang Mai

While newer versions are now replacing older L-39s in service, thousands remain in active service as trainers, and many are finding new homes with private owners all over the world. This is particularly evident in the United States, where their $200,000-$300,000 price puts them in range of moderately wealthy pilots looking for a fast, agile personal jet. Their popularity has led to a purely L-39 'Jet Unlimited' class at the Reno Air Races. As of mid-March 2006, there are 257 L-39s in the US Federal Aviation register.

[edit] Variants

L-39X-02 - X11
Ten prototypes.
L-39C (C for Cvičná - training)
Standard production version.
L-39V (V for Vlečná - tug)
Single-seat version for target tug KT-04, eight built.
L-39ZO (Z for Zbraně - weapons)
A four pylon light attack variant with a strengthened wing structure.
L-39ZA
Significantly upgraded L-39ZO, employing sturdier landing gear, a higher payload and notably the GSh-23L - 23 millimeter twin barrelled cannon attached in a conformal pod under the pilots' compartment, having a 150 round magazine within the airframe.
L-39Z/ART
Thai version with Elbit avionics.
L-39MS
The Aero L-39MS Super Albatros is a Czech military trainer aircraft developed from the firm's earlier L-39. Compared to its predecessor, it featured a strengthened fuselage, longer nose, a vastly updated cockpit, and a more powerful engine. At the time of its first flight on September 30 1996, it was later designated as the L-59.

[edit] Operators

Main article: List of Aero L-39 Albatros operators
An Estonian L-39 in flight
An Estonian L-39 in flight
A civil L-39C Albatros in Australia
A civil L-39C Albatros in Australia
A Slovak L-39ZA (1701) in Biele Albatrosy colors at Radom Air Show 2005
A Slovak L-39ZA (1701) in Biele Albatrosy colors at Radom Air Show 2005

[edit] Notable incidents

  • 24 January 2001 Atlas Air Founder, Chairman and CEO Michael A. Chowdry was killed Jan. 24 when his Czech L-39 jet trainer crashed into an open field near Watkins, Colorado. Also killed was Wall Street Journal aerospace reporter Jeff Cole. Chowdry and Cole were making a previously planned flight from Front Range Airport.[1][2]
  • 02 July 2003 Elmo Hahn, 54, a developer and well-known pilot in Muskegon, Mich., died soon after the crash. Hahn was returning to Muskegon after filming a segment about the L-39 Albatross for CNN. He was lifting off in his aircraft and ejected from the plane, but did not survive. [3]
  • 16 March 2007 An L-39 crashed at the Tico Warbird air show at Space Coast Regional Airport in Titusville, Florida, killing the pilot.[4] The pilot was identified as attorney Eilon Krugman-Kadi, 58, of Gainesville, FL, a former Israeli fighter pilot.[5] The L-39 had been built for the Soviet air force in 1980, and was demilitiarized in 1999 from Ukraine.[6]
  • 13 September 2007 Air race pilot Brad Morehouse of Afton, Wyoming was killed when his L-39 crashed in a race at the Reno Air Races. According to newspaper reports, it appeared that pilot lost control when the plane was caught in wake turbulence generated by other racers.[7]

[edit] Specifications (L-39C)

Orthographically projected diagram of the Aero L-39 Albatros.

General characteristics

  • Crew: 2: student and instructor
  • Length: 12.13 m (39 ft 10 in)
  • Wingspan: 9.46 m (31 ft 0 in)
  • Height: 4.77 m (15 ft 5 in)
  • Wing area: 18.8 m² (202 ft²)
  • Empty weight: 3,459 kg (7,625 lb)
  • Max takeoff weight: 5,700 kg (12,560 lb)
  • Powerplant: 1× Progress/Ivchenko AI-25TL turbofan, 16.9 kN (3,800 lbf)

Performance

Armament

  • Up to 1,290 kg (2,840 lb) of stores on four external hardpoints, including:
  • AAMs (K-13 and R-60) missiles
  • 7.62 mm machine-gun pods
  • free-fall and cluster bombs
  • rocket launchers
  • drop tanks

[edit] See also

Related development

Comparable aircraft

[edit] References

  1. ^ [1]
  2. ^ [2]
  3. ^ [3]
  4. ^ [4]
  5. ^ [5]
  6. ^ [6]
  7. ^ [7]

[edit] External links

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