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This engine was to be used only for tests at the Martin plant, after which it was to be replaced by a flight engine before GLV-2 was shipped to the Cape. Horizontal testing of GLV-2 was completed January 17. Before GLV-2 was erected in the vertical test facility, a longitudinal oscillation (POGO) kit was installed in stage I. The kit comprised an oxidizer standpipe and a fuel surge chamber designed to suppress pressure pulses in the propellant feed lines and thus reduce POGO to a level consistent with manned flight.