Apollo+40: T-00:30:00

From the Apollo 11 PAO Transcript:


This is Apollo/Saturn Launch Control. We've Just passed the 31 minute mark in our count. At T minus 30 minutes 52 seconds and counting, aiming toward our planned liftoff time of 32 minutes past the hour, the start of launch window on this the mission to land men on the Moon. The countdown still proceeding very satisfactorily at this time. We've got by an important test with the launch vehicle checking out the various batteries in the 3 stages and instrument unit of the Saturn V. We remain on external power through most of the count to preserve those batteries which must be used during the powered flight. We've Just taken a look at them by going internal and then switching back to external again. The batteries all look good. The next time we go internal will be at the 50 second mark with those batteries and they will remain, of course, on internal power during the flight. The lunar module, which has been rather inactive during these latter phases of the count also is going on internal power at this time on the 2 batteries on the ascent stage and the 4 batteries on the descent stage. For the next 20 minutes we will take a look at some systems in the lunar module and then power down at about the 10 minute mark in the count, power down the telemetry to preserve the power of the LM. The lunar module on Apollo 11, of course, when it separates from the command module in lunar orbit, will have the call sign Eagle. The command module call sign, once the 2 vehicles separate, will be Columbia. Both Columbia and Eagle are GO at this time at 29 minutes 24 seconds and counting. This is Kennedy Launch Control.