Soyuz 7K-L1 No.4L

Uncrewed Soyuz 7K-L1 No.4L (Zond 4a), a Soviet circumlunar L1 prototype. Proton-K/Blok D from Baikonur Site 81/23 failed on 27 September 1967 when a first-stage RD-253 engine failed; the launch-escape system saved the reentry module.

Outcome

Failure

Payload to orbit

Did not reach orbit

Flight

3rd

of 38 Proton / UR-500 K/D flights

Date and time

27 September 1967, 22:11 UTC

Rocket

Proton / UR-500 K/D

Builder

Khrunichev

Launch site

81/23 (81L), Baikonur Cosmodrome, Republic of Kazakhstan

Payload

Unknown

Launches in 1967

104th of 139