An astronaut's view on reentry

-Temporarily not more than a scratchpad to sort my memory; structure and "eyecandy" will follow later ;-)-

-Parts of entry: Pre-entry (P61,62,63), Initial steering (P64), Constant drag & upcontrol (P65) + Ballistic Phase (P66) (will only be entered when specific conditions are met; otherwise: P64 -> P67!); Final steering (P67 w. N66); End of steeering (P67 w. N67)

How everything starts:

V37E61E

P61

FL V06N61

+/- XXX.XX IMPACT LAT - Latitude of desired splashdown point. + is north, - is south

+/- XXX.XX IMPACT LONG - Longitude of desired splashdown point. + is east, - is west

+/- 00001 HEADS UP/DOWN - Switch for roll attitude when approaching 0.05g. + is heads up (lift DOWN), - is heads down (lift UP). Lunar entry was flown with lift up (-00001), earth entry with lift down (??)

V25E to change data. Note that P37 stores its predicted splashdown point here (handy, isn't it?;-)).

PRO to proceed

FL V06N60

XXX.XX G MAX - predicted peak G during entry

XXXXX VPRED - predicted velocity at 400.000 ft altitude in fps

XXX.XX GAMMA EI - flight path angle (= entry angle) at 400.000 ft altitude in degrees

PRO to proceed

FL V06N63

XXXX.X RTOGO - range to go from 0.05g in nautical miles

XXXXX VIO - velocity at 0.05 g

XXBXX TFE - time from now to 0.05 g. NOT UPDATED CONTINOUSLY!

RTOGO and VIO can be used to initialize the EMS.

PRO to P62

P62

FL V50N25

00041 - checklist code for: "please perform CM/SM separation"

BLANK

BLANK

Perform CM/SM separation; key PRO when done

-CSM DAP off; entry DAP on in attitude hold; further V37 inhibited from now on-

FL V06N61

+/- XXX.XX IMPACT LAT - Latitude of desired splashdown point. + is north, - is south

+/- XXX.XX IMPACT LONG - Longitude of desired splashdown point. + is east, - is west

+/- 00001 HEADS UP/DOWN - Switch for roll attitude when approaching 0.05g. + is heads up (lift DOWN), - is heads down (lift UP). Lunar entry was flown with lift up (-00001), earth entry with lift down (??)

V25E to change data. Last chance to change the splashdown point.

PRO to proceed

-entry DAP maneuvers to entry attitude; SC CONT to CMC for auto-maneuver or to SCS for manual control (CMC drives error needles on FDAI for desired attitude); manual is recomended (entry DAP has wide deadband and damps rates very slowly), when needles are centered SC CONT to CMC-

V06N22

XXX.XX OG ROLL

XXX.XX OG PITCH

XXX.XX OG YAW

Desired attitude in yaw, pitch, roll. Note that display is skipped and P63 is selected when alfa (angle of attack) is already > 45°.

P63 automatically selected 21 s after alfa > 45°.

P63

FL V06N64

XXX.XX G - actual acceleration in G.

XXXXX VI - actual inertial velocity in fps

XXXX.X RTOGO - range to go to splashdown point. Negative and decreasing when approaching

Display is updated continously. When 0.05 g (R1 reads 00005 or more) is attained, P64 is selected automatically.