The Letov ST-4 Aztek is a side-by-side ultralight aircraft produced by
Letov a.s. as a kitbuilt aircraft. Due to its design, the ST-4 Aztek
could be used as an elementery trainer. Company history of Letov dates
back to the first Czechoslovak aircraft factories founded in 1918 by the
Czechoslovak Defense Ministry to repair the aircraft of the Czechoslovak
Air Force obtained after the WW I. In 1923, Československou vojenskou továrnu na letadla,
Letov (Czechoslovak military aircraft factory, Letov) was established.
Over the years, Letov developed and produced a number of military and civil aircraft including
gliders, bombers, fighters, trainers and transport aircraft. In 1991,
Letov entered the microlight market with the single-seat high-wing Letov
LK-2 Sluka ultralight. In 1996, the Letov ST-4 Aztek was introduced. The
ST-4 Aztek was produced in the Letov factory until its bankruptcy in
1998. Substantial restructuring of the Letov company was performed. From
the former Letov Aircraft Product Division, the daughter company Letov
Letecká výroba a.s, was established. The new company was responsible for
the production of parts and subassemblies for airliners and for the new
Czech combat aircraft L-159 ALCA. Letov Letecká výroba was sold to Group
Latécočre and production of LK-2, LK-3 and ST-4 was cancelled including
any maintenance or support to the owners. On 1 June 2000, Letov Letecká
výroba s.r.o. became a 100% subsidiary company of Latecoere, France.
However factory production of the LK-2, LK-3 and ST-4 was cancelled in
1998, it was not yet the end of the production of these ultralights. Over the
years, limited production was going on using the remaining tools and
material purchased by a private builder.
The 1996-built Letov ST-4 Aztek s/n 402 was registered PH-2X6. with Ultra Light Nederland BV, Lelystad,
on 3 September 1996. The aircraft is powered by a Rotax 528 UL DCDI
2-stroke engine. On 6 Movember 1998, Letov ST-4 Aztek PH-2X6 was
registered with L.U. Bergsma, Tuk. On 4 January 2006, the aircraft was
registered with its present owner, G. Postma, Zwagerbosch. Letov
ST-4 Aztek PH-2X6 was photographed at the ULM-aerodrome Stadskanaal in Vledderveen, the Netherlands.