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"Technical Information Summary Apollo-9 (AS-504) Apollo Saturn V Space Vehicle."

The document presents a brief and concise description of the Apollo 9 Saturn Space Vehicle.

"Technical information summary Apollo-10 (AS-505) Apollo Saturn V space vehicle."

The document presents a brief and concise description of the AS-505 Apollo Saturn Space Vehicle. Where necessary, for clarification, additional related information has been included.

"A summary of major NASA launchings" between October 1st and December 31st, 1968.

This is the first Quarterly Supplement to the October 1968 edition of GP 381, ''A Summary of Major NASA Launchings (Eastern Test Range and Western Test Range)." This Supplement covers the period from October 1 to December 31, 1968. Two additional Quarterly Supplements will be issued during 1969. Each of these will list those major NASA launchings occurring during the three-month period it covers. The basic publication will be revised and reissued, incorporating the information contained in the Supplements, as well as covering the final three-month period, subsequent to October 1, 1969. William A. Lockyer, Jr.

"Statistical model for Saturn electrical support equipment mission availability."

This report presents the logic leading to a mathematical expression for mission availability. Mission availability is treated as the probability that the cumulative downtime occurring during a mission of given length will be less than the time constraint. This is opposed to more general approaches such as steady state or instantaneous availability or operating time versus real time. We intend to present a practical and usable mathematical model by deduction and demonstration. The development is based on exponentially distributed downtimes. Experience shows that certain systems follow exponential downtime distributions except near zero. This error is often so small that it may be neglected. A future report will present a downtime distribution which will account for this small error.

"A new telemetry technique."

A technique new to telemetry is discussed which promises to alleviate an enigma facing the telemetry engineer : How to adequately transmit the avalanche of vibration and other wideband data desired in the development phase of large missiles and launch vehicles. The data channels are stacked in the frequency spectrum as single sideband subcarriers which frequency modulate the RF carrier. The system design utilizes to advantage the statistical properties of vibration data to achieve maximum data transmission efficiency from the available RF carrier deviation. However, in contrast to proposed statistical predigestion techniques, the data is transmitted in raw form.

"Sperry Rand monthly progress report for July, 1969."

The following pages contain reports for each of the individual contract appendices covering technical progress and accomplishments, related problems, and staffing progress. The report of manhours expended against each appendix by schedule order is being submitted as a part of the financial management report.

STS 51-L Data and Design Analysis Task Force Lessons Learned Report.

This report was produced by the Data and Design Analysis Task Force "to support the Presidential Commission appointed by President Ronald Reagan to investigate the loss of the Space Shuttle Challenger and its crew." The report includes details from investigations in the areas of Development and Production, Prelaunch Activities, Accident Analysis, and Mission Planning and Operations. The report includes a recommendation to conduct an investigation "into the manufacturing process, final delivery and material cutting of the O-rings" that failed during the accident.

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