Preliminary Gemini 4 Crew Debriefing, Part II, 1965

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thrusters continued to fire throughout t he
maneuver at intervals like there was indeed a
signal coming from the Horizon Scan Mode.
As
the spacecraft started back down toward the
horizon, I thought sure that the horizon scanner
would catch the horizon, because at this time
the sun was no longer right on the horizon.
However, we developed a slight amount of roll
during the l ast 120 to 150 degrees of pitch,
and as we went down through the horizon, we were out
of limits in roll and Horizon Scan did not pick
up the horizon.
I then took over the spacecraft
and maneuvered back to a position from which the
Horizon Scan Mode could r eacquire and -put it
in t his condit ion. It s tayed locked on.
Ed has
a few notes here.
We ' ll have him read his.
About the only notes that I ma.de on .the scanner
was that at sunset and sunrise it had a tendency
to break lock.
I have a note her€ that at 22: 22, at
sunset with the sun right on the scanner, i . e.
90 degrees to the spacecraft, the scanner
broke lock three different times.
At 22: 58, a t
sunrise, the scanner put in spurious inputs
but was abl e t o control and didn ' t lose lock.