Apollo 11 at 55: July 20 — the landing

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More abstract art from the Flight Plan.

REV 10   

94:00  eat period

…….95:00  CDR & LMP don LCG’s  (liquid-cooled underwear)

……………………. LMP — copy baseline altitude (that’s Buzz, the Lunar Module Pilot)

CMP:  Don PGA w/o helmet and gloves  (Mike suits up)

 ………………….Open and stow CM hatch

LMP:  Verify docking tunnel index angle 

 …………………..IVT to LM  (Buzz enters the Lunar Module)

REV 11

96:00  CDR — Don PGA w/o helmet and gloves

 ………………LMP  — LM familiarization

 …………………………LM power on

……………….CDR — disconnect and stow LM power umbilical

……………………………….LMP — EPS activation  (That’s the electrical subsystem)

…………………………………………. Mission timer activation

………………………………………….Primary glycol loop activation.

………………………………………….Caution/Warning checkout

96:50  CDR — IVT to LM  (Neil enters the LM)

 ………………………………………Transfer helmet & gloves

 ………………………………………ECS activation and c/o (That’s the environmental systems)

……………… LMP — PGNCS turn-on and self test   (That’s the primary navigation system)

……………………………….S-Band steerable Antenna activation

CDR — VHF-B activation

 LMP — IVT to CSM  Buzz returns to the Command Module)

………….Don PGA (Buzz suits up)

97:30  CDR — Docked IMU coarse align, report gimbal angles and time to MSFN

…………………..Slew steerable antenna

              LMP — IVT to LM  (Buzz returns to the LM)

CMP — PGA pressure integrity check  (That’s Mike in the Command Module)

 ……………….Install drogue & probe

CDR — Verify drogue and probe installation

LMP — Ascent battery activation and checkout

…………….CMP — cock latches  (That’s the docking latches)

 ……………………Install hatch

………………………………Vent tunnel

……………………..Hatch integrity check

REV 112

98:00   CDR & LMP — Don helmet & gloves

………………………………..Cabin regulator check

…………………………………Doff helmet & Gloves

CDR — Copy DAP data  (That’s th Digital Autopilot)

………………………Rate gyro check

………………………….LMP — AGS act. & self test  (That’s the backup guidance system)

 ……………………………………V47  Initialize AGS

CDR —    Load DAP data

 …………………..DPS gimbal drive and throttle test  (That’s the descent engine)

……………………………… RCS Pressurization  (That’s the thruster system)

………………………………………….Go/no go for undocking

……………………………….RCS checkout

REV 13

100:00  CDR — DPS press. & checkout  (that’s the descent propulsion system)

…….LMP  AGS accel. & gyro calibration  (the back up or “abort” guidance system) 

……..CDR — DAP data load

…………………………………………Don helmets & gloves

………………………………………….Prepare for undocking

………………………………………….100:15  UNDOCK

…………..CDR — Yaw left 60 degrees, pitch up 110 degrees, set ORDEAL

……………………………………………………………………….(That’s the orbital displays)

………………………Yaw 360 degrees, LM inspection

CSM separation GET:  100:39:50 

…………………………..P41 RCS thrust

……………………………BurnTime:  8 sec.

CDR — LR act. and self test  (That’s the landing radar)

…………………………VHF ranging

LMP — systems checks

……………….V47  AGS align

MCC — Go/no go for DOI  

(That’s Mission Controls go to enter the lower descent orbit)

CDR — DPS thrust (the descent propulsion engine) 

……………..MNVR to DOI attitude

…………………..DPS, DOI

…………….GET Ignition:  101:38:48  

……….(That’s the ignition time in Ground Elapsed Time since launch)

………………..Ullage:  2 jet, 7.5 sec.  (That’s a thruster burst to settle propellants)

………………..Burn Time :  28.5 sec.

                               Delta V:  70 FPS  (That’s change in velocity)

                                Orbit 8.97 X 57.87

REV 14

101:52    CDR — Load DPI + 12 abort (descent and abort information)

……………………….Pitch down to 125 degrees

……………………….Yaw left 180 degrees

CMP — Sextant and VHF tracking of LM

……………..CDR —  P52 Pitch alignment check

…………………………..Pitch to 285 degrees

102:15   CDR —  LPD altitude, attitude position check

……………………….Go/No go for PDI

…………………..(That’s the go for powered descent to the surface)

………………………..LPD altitude, attitude position check, 

…………………………Ullage, 7.5 sec.

…………………DPS, PDI

………………..GET Ignition:  102:35:13

                            Burn Time:  11 min. 58 sec.

(That’s the time until landing — unless they have to hover)

CDR — Alt check

………………yaw right 174 degrees then 6 degrees

LMP — systems monitor

CDR — Evaluate manual control

 …………..Horizon visible

………………….pitch over at P64   (Called “High Gate” — landing site visible)

……………………..”Low Gate” — 500 ft. altitude

……………………..Manual attitude control

                       TOUCHDOWN   102:47:11

That would have been the landing time, measured since launch, as in the flight plan.  In reality, due to mid-flight adjustments, they landed at 102 hrs. 45 min. and 40 sec.  Yes, a bit earlier than set in the July 1 flight plan, even thought the powered decent took longer because auto system targeting them toward a crater.  Armstrong was forced to fly over it manually, find a smooth spot, and land with just seconds of fuel left.  Instead of 11 min. 58 sec., the powered descent too 12 min. 35 sec. Fuel margins were that tight. 

Landing took place at 4:17 p.m. EDT.  And 6 hr. 39 min. later, Neil Armstrong stepped on the lunar surface.

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