Just for the record. . .
From the Apollo Lunar Surface Journal at https://www.hq.nasa.gov/office/pao/History/alsj/a11/a11.landing.html with some technical commentary omitted to shorten the post. Get all the fun techie details at the link listed above. Time stamps are MET – mission elapsed time, or (most of the time) the hours:minutes:seconds since liftoff.
102:45:40 Aldrin: Contact Light.
[At least one of the probes hanging from three of the footpads has touched the surface. Each of them is 67 inches (1.73 meters) long. The ladder strut doesn’t have a probe. Buzz made the call at 20:17:40 GMT/UTC on 20 July 1969.]
. . .
102:45:43 Armstrong (onboard): Shutdown
102:45:44 Aldrin: Okay. Engine Stop.
[Neil had planned to shut the engine down when the contact light came on, but didn’t manage to do it.]
. . .
102:45:45 Aldrin: ACA out of Detent.
102:45:46 Armstrong: Out of Detent. Auto.
102:45:47 Aldrin: Mode Control, both Auto. Descent Engine Command Override, Off. Engine Arm, Off. 413 is in.
102:45:57 Duke: (Reporting that Houston has received telemetry confirming engine shutdown and that they have heard Buzz’s transmission regarding address 413) We copy you down, Eagle.
102:45:58 Armstrong (onboard): Engine arm is off. (Pause) (Now on voice-activated comm) Houston, Tranquility Base here. The Eagle has landed.
102:46:06 Duke: (Responding to Neil’s transmission but momentarily tongue-tied) Roger, Twan…(correcting himself) Tranquility. We copy you on the ground. You got a bunch of guys about to turn blue. We’re breathing again. Thanks a lot.
102:46:16 Aldrin: Thank you.
[It is easy to understand how Charlie got momentarily tongue-tied when Neil reported the landing. There was not only the excitement and thrill of what they had all just achieved; but, also, after the intense concentration of the last few minutes, the sudden change in call sign from “Eagle” to “Tranquility”.]
Bob- also, Neil never used the ‘Tranquility Base’ call sign in any of the simulations, so Charlie was surprised to hear it.
102:46:18 Duke: You’re looking good here.
102:46:23 Armstrong: Okay. (To Buzz) Let’s get on with it. (To Houston) Okay. We’re going to be busy for a minute.
[They will now prepare for immediate lift-off, in case, as an example, they have damaged an ascent fuel tank in the landing.]
[Aldrin – “Yeah, there are things that should happen.”]
[Armstrong – “Crisp(ly).”]
[Aldrin – “Yeah, ‘Crisp’ is a good word. Because there are discrete abort times that you try to adhere to if you see something leaking, something going wrong.”]
[Armstrong “Like, perhaps, if one footpad starts to sink into the surface and you’re losing stability. Or you have a propellant tank pressure problem, or something that would cause us to go quickly.”]