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1993-04-21
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OFFICE OF PUBLIC INFORMATION
JET PROPULSION LABORATORY, CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIFORNIA. TELEPHONE 354-5011
FOR IMMEDIATE RELEASE Thursday, September 22, 1966
Surveyor II will impact southeast of the crater Coper-
nicus at 8:18 p.m. PDT tonight. The landing time and zone is
based on analysis of the flight path prior to loss of contact.
Contact with the spacecraft was lost at 2:35 a.m. today
when there was a failure in the communications or power system
during the firing of the 10,000 pound thrust retro engine. Up
to the time of loss of contact, despite the tumbling motion of
the spacecraft, there was no evidence of further failure in the
spacecraft beyond the failure of vernier engine number 3 to fire
upon command.
The retro was ignited to provide valuable engineering
information on the firing of a large solid fuel motor in the
vacuum of space when it became apparent that Surveyor II could
not be soft landed on the moon. It is not possible to test
fire the large Surveyor retro motor in a vacuum on Earth to
obtain engineering data.
Engineers at the Jet Propulsion Laboratory made 38
attempts yesterday to ignite vernier engine number 3 that had
failed to fire during an attempt to perform a midcourse correc-
tion Tuesday night. The failure of one of the three vernier
engines to fire threw Surveyor II into an uncontrolled tumbling
motion. Efforts to re-stabilize the spacecraft failed. b
-2-
The attempts to re-establish control were continued
until early today. When it became apparent that the soft
landing could not be performed, a series of engineering experi-
ments to check terminal descent systems aboard the spacecraft
were conducted, ending with the firing of the main retro.
411-9/22/66