Kosmos 434 (Russian: Космос 434; meaning Cosmos 434) was the final unmanned test flight of the SovietLK Lander. It performed the longest burn of the four unmanned LK Lander tests. It finished in a 186 km by 11,804 km orbit. This test qualified the lander as flightworthy.
The LK was the only element of the Soviet manned lunar programs that reached this status. In 1980-81 there were fears that it might carry nuclear fuel. When in reentered over Australia on August 22, 1981 the Soviet Foreign Ministry in Australia admitted that Kosmos 434 was an “experiment unit of a lunar cabin,” or lunar lander.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in brackets.