This note is to inform everyone that the AS-502 spacecraft computer program ropes will be made precisely the same as those for AS-501. Specifically, it is MIT assembly Solarium 55. You recall Solarium 54 was our original AS-501 A-release, but it was necessary to make a modification in one of the rope modules to correct…
Category: Apollo 4
501/502 state vector update requirement
During the 501 operation apparently there was no question as to whether state vector updates would be sent. But I gather there may have been some question as to how important they are. This will probably just add to the confusion, but I thought I might redistribute the attached memos written last January which stated…
State Vector Update Criteria for AS-501
Because of the decision to utilize the AS-502 Apollo Guidance Computer programs for the AS-501 mission, the mission was designed and developed on the premise that the state vector updates __would__ be made. ���������� this, the situation exists that a __perfect__ launch vehicle spacecraft combination __without__ guidance or propulsion errors of any kind will land…
State vector update situation for AS-501 and AS-502
The AS-501 and 502 missions have been designed to update the state vector (position and velocity) in the Apollo Guidance Computer (AGC) with a state vector from the Manned Spaceflight Tracking Network (MSFN) prior to the Saturn (S-IVB) out-of-orbit burn and again prior to the second Spacecraft Propulsion System (SPS) burn. If these updates are…
Progress Report – RTCC program development reduction – Review of requirements for the AS-502 mission
On February 17th we held a meeting in our continuing effort to reduce the program development demands on the Real Time Computing Complex. In this instance, a group of FCD, FSB and MPAD people reviewed requested modifications to the AS-501 RTCC program in preparation for the AS-502 mission. I could briefly summarize the results by…
Apollo Spacecraft Computer Program Schedule
Since last week I promised to start quoting some delivery dates, here goes. We are currently planning release of the flight programs for rope manufacture as follows:…
Small program change needed in the AS-501/502 AGC program
In the course of development of the AS-206 computer program at MIT, a coding error was discovered which was immediately recognized as being common to the AS-204 and AS-501/502 programs. It is a scaling error, if you know what that means, which imposes the operational constraint of not operating one of the integration programs (i.e.,…
New/old platform for AS-501
Cline Frasier told me today that the platform in Spacecraft 107 (that is, AS-501) has been replaced again by the one that was taken out several weeks ago. Apparently, there was an intermittent problem in one of the accelerometers. I believe Cline said they have replaced the Z-gyro. This change should be beneficial in terms…
Greater dispersion at entry on AS-501 with the new IMU
You have expressed concern about the somewhat poorer performance of the new platform in Spacecraft 017. While at MIT last week Dan Lickly and I spoke to John Miller about this. John says the component which contributes the most to dispersion in flight path angle at the entry interface is the Y gyro, as you…
AGC program for AS-501/502 – Final status report
The attached memorandum lists all of the program changes required to the AS-202 program to fly AS-501 and AS-502. As you can see, there are quite a few, although most are quite simple. For example, some of these changes are merely corrections to bugs that were known to be in the AS-202 program when we…