Gemini 7 Technical Debriefing, 1965

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1JO
pitch down at guidance initiate.
Attitude indications were
nominal all the way through.
At insertion, the nomi nal
velocity on address 72 was 25,804 and when we read it up, i t
read 25,804.
The orbit maneuvers using the computer and
the platform were right on the money.
The accelerometer
bias did not vary, and we burned them off on the IVI
1a by
inserting them through the MDIU, and it came out very well .
I did not burn on time, we burned on t he IVI's.
Borman
The updates were all made in the PRELAUNCH mode as agreed on
before fli ght .
There was no problem, no mi sunderstanding,
I think F0D did very well i n this regard.
I know that in
Gemini 5 t here was a little mix-up, but we had none of that.
Borman
Retrofire occurred automatically at the exact second. All
four Retros f ired and the IRS was right on the money.
Reentry
guidance was nominal.
It was very simi lar to the simulations
that we had f l o.m.
There was one little anomaly in the guid­
ance, in t hat we were gi ven back-up reentry angles of
50 degrees.
We computed wi th our onboard char ts a reentry
angle of 50 degrees, back-up angle of 50 degrees.
But then
after tracking, the ground called up a 35 degrees which proved
to be closer to what we actually f l ew.
I am still not aware
of the reason for change; why it changed from 50 degrees t o
35 degrees. The important t hing i s t hat it did change and the
ground was able to update us in real time, and it agreed very
well with the a