Gemini 5 Technical Debriefing, Part II, 1965

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1
8.1 Platform
Cooper
8.O SYSTEMS OPERATIONS
By day we used standard procedure of finding a
zero yaw, which is a little easier to do down at
about retro position.
The nose is a little bit
in the way for determining zero yaw unless you
pitch down just a little past nose low in zero­
zero- zero position.
When pitched down just a tiny
bit, zero yaw was very readily apparent to within
a fairly reasonable degree of accuracy, and then
ease it right on up.
We had lines for the zero­
zero position to give us our pitch and roll on the
horizon.
This was the regular day alinement.
Night was pretty much the same except we 1d get
zero yaw by a star, get roll and pitch by the zero
lines on the window (or knowing where they were
approximately) line this with the top of the air­
glow or the horizon. At that point you'd go into
Cage, hold it there at that position until it
caged) then uncage the platform to BEF or SEF
whichever the case might be, and then to to Plat­
form and Attitude on the FDM and FDI's.
Then
aline the platform fine aline SEF or BEF by keeping
,