HESA Dorna

Dorna
General information
TypeJet trainer aircraft
National originIran
ManufacturerOwj Industrial Complex, Islamic Republic of Iran Air Force
StatusRetired; preserved as a museum exhibit
Primary userIslamic Republic of Iran Air Force
Number built1
History
First flight1 April 1991
Developed intoOwj Tondar
Owj Tazarve

The Dorna (Persian: درنا, romanized: Dornā, lit. 'Crane') was an Iranian single-engine jet-powered trainer aircraft and the first prototype built under the Iranian Air Force's "Ya-Hossein" programme, an effort begun in the late 1980s to design a locally built advanced jet trainer.[1][2] Built at the Air Force's Owj Industrial Complex near Mehrabad, Tehran, with early technical assistance from South Africa's Atlas Aviation, the sole Dorna prototype — serial 139 — first flew on 1 April 1991, flown by F-5 test pilot Colonel Sadegh-Poor.[1] Although Iranian officials publicly stated in 1999–2000 that the Dorna had entered production, no independent evidence supports series manufacture; the design was instead reworked into two further prototypes, the Tondar (1998) and the Tazarve (2001), before the programme was abandoned after a fatal crash in 2007.[2] The original Dorna airframe survives as a static exhibit at the Islamic Republic of Iran Air Force Museum at Doshan Tappeh Air Base, Tehran.

Background

Following the Iranian Revolution and during the Iran–Iraq War, Iran lost access to Western flight-training aircraft and could no longer send pilots abroad for advanced jet training. To close the resulting gap, the Iranian Air Force pursued two parallel efforts: converting surplus single-seat Northrop F-5A airframes into two-seat "Simorgh" trainers, and designing an entirely indigenous advanced jet trainer under a project named Ya-Hossein.[2] The work was assigned to the Air Force's own Owj Industrial Complex at Mehrabad, a design and manufacturing bureau established during the war to develop fighter, attack and trainer aircraft and to produce spare parts for the existing fleet.[3]

Development and first flight

With assistance from engineers at South Africa's Atlas Aviation and Iranian aerospace engineers, including Yaghub Entesari, Owj built its first flying prototype under the Ya-Hossein programme and named it Dorna. The aircraft, carrying serial 139, made its maiden flight on 1 April 1991, piloted by Iran–Iraq War veteran and F-5 test pilot Colonel Sadegh-Poor.[1] It was a small tandem two-seat jet of conventional configuration. The prototype did not fully satisfy the Air Force's requirements, and from 1994 the design was substantially reworked rather than developed further in its original form.[1]

From 1994 the design was substantially reworked into a second prototype, the Tondar (serial 778-1), completed in November 1997 and first flown on 17 February 1998. This was in turn redesigned into a third prototype, the Tazarve (serial 778-2), which first flew on 22 January 2001 and was publicly unveiled at the Kish Air Show in October–November 2002.[1][4] The Iranian Air Force reportedly ordered five development examples and 25 production Tazarves, none of which were completed before the programme's cancellation.[5]

Official claims of production

Brigadier General Habib Baghaei, commander of the Islamic Republic of Iran Air Force from 1995 to 2001, who announced in 1999 that a locally designed Dorna trainer had "entered production".

In February 1999, Air Force commander Brigadier General Habib Baghaei reported on the service's progress in domestic aircraft manufacturing, and by June of that year he stated that a locally designed Dorna trainer had entered production.[3] On 17 May 2000, acting Air Force commander Brigadier General Iraj Osareh told a press conference that the Azarakhsh fighter, the Dorna, and the Parasto trainer had "reached the stage of mass production," adding that a "third Dorna" and further Parasto trainers were being built at the time.[6]

No independent source has ever confirmed the existence of more than the single original Dorna airframe, and the claims of mass production are widely regarded by aviation historians as unverified official statements rather than established fact, consistent with a broader pattern of Iranian state media overstating the maturity of domestic military aircraft programmes.[2]

Cancellation and current status

The Ya-Hossein programme ended after a fatal accident. Ahead of the 22 September 2007 Holy Defense Week parade, the Air Force ordered three Tazarve-type aircraft made flyable; lacking a third airframe, engineers hastily returned the retired Tondar prototype to flying condition, re-designated as a third Tazarve. Two days before the parade, during a check flight near Karaj, the aircraft's wings separated in flight; the rear-seat pilot ejected safely, but the pilot in the front seat, Colonel Mojtaba Mir-Asgari, was killed. A June 2008 investigation attributed the failure to substandard rivets used in the rushed rebuild.[7] The programme was cancelled, and the two surviving Tazarve airframes were grounded and stripped of usable parts.[7]

The original Dorna prototype (139), along with the surviving Tazarves, is preserved as a static exhibit at the Islamic Republic of Iran Air Force Museum at Doshan Tappeh Air Base, Tehran, where it has been photographed on display as recently as 2019. Iran's requirement for an indigenous advanced jet trainer was eventually addressed by an unrelated, later design, the Kowsar-88/Yasin, which first flew in 2019.[2]

Design

Reliable technical data specific to the Dorna prototype are limited, and many published specification tables in fact describe its descendant, the Tazarve, rather than the Dorna itself.[8] The Dorna is generally described in secondary sources as a small, tandem two-seat jet trainer of conventional configuration. Its powerplant is disputed: some sources report a single non-afterburning General Electric J85 turbojet, but Taghvaee attributes this specific engine to the succeeding Tondar and Tazarve prototypes rather than to the Dorna itself, leaving the Dorna's original engine unconfirmed.[1]

Variants

Dorna
The original 1991 proof-of-concept prototype (serial 139), the subject of this article.
Tondar
A substantially redesigned second prototype (serial 778-1), first flown in 1998.
Owj Tazarve
The third and final iteration of the design (serials 778-2 to 778-4), publicly unveiled in 2002 and cancelled after a fatal crash in 2007.

See also

References

  1. 1 2 3 4 5 6 Taghvaee, Babak. "From the Dorna to Tazarv". EDR Magazine. Retrieved 24 July 2026.
  2. 1 2 3 4 5 Taghvaee, Babak (12 December 2023). "Is Iran's 33-year search for an advanced jet trainer over?". Key.Aero. Retrieved 24 July 2026.
  3. 1 2 "Tazarv / Tondar / Dorna". GlobalSecurity.org. Retrieved 24 July 2026.
  4. ↑ Duffy, Paul (19 November 2002). "US sanctions drive industry progress". Flight International. Vol. 162, no. 4858. p. 24.
  5. ↑ Hewson, Robert (2003). Ya Hossein Tazarve: Iran's Own Jet Trainer. International Air Power Review. Vol. 8. Norwalk, Connecticut: AirTime Publishing. pp. 16–17. ISBN 1-880588-54-4.
  6. ↑ "Commander: Iranian Air Force Highly Equipped". Archived from the original on 4 April 2022. Retrieved 26 December 2012.
  7. 1 2 Taghvaee, Babak. "Project Ya-Hossein shot-down". EDR Magazine. Retrieved 24 July 2026.
  8. ↑ "Owj Ya Hossein / Tazarve". Military Factory. Retrieved 24 July 2026.


This page is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.