GRAA NEWSLETTER
P.O. Box 1184, Greenbelt, MD 20768-1184


 

February 2017 http://graa.gsfc.nasa.gov 33rd Year of Publication

IMPORTANT DATES

February 14 Mark your calendar for the GRAA Luncheon at 11:30 a.m. at the Greenbelt American Legion Post #136 at 6900 Greenbelt Road. Reservations are required for our venue, so please contact Alberta Moran on her cell phone at 301-910-0177 or via her new email address at bertiemae90@gmail.com not later than noon on Friday, February 10th. Our featured speaker will be Dr. James Gleason, Chief of the Atmospheric Chemistry & Dynamics Laboratory of the Sciences and Exploration Directorate and Senior Project Scientist for the NOAA/NASA Joint Polar Satellite System Program (JPSS). The title of his presentation will be “JPSS: The Next-Generation of Polar-orbiting Weather Satellites.”
March 14 Mark your calendar for the GRAA Luncheon at 11:30 a.m. Dr. Michael Mumma, Senior Scientist in the Solar System Exploration Division of the Sciences and Exploration Directorate, will be our featured speaker. The title of his presentation will appear in next month’s newsletter.

COMMENTS FROM TONY COMBERIATE, GRAA PRESIDENT: Our January luncheon speaker was Dr. Henning Leidecker, Goddard’s Chief Failure Analyst in the Electrical Engineering Division of the Applied Engineering & Technology Directorate. His talk, entitled “Adventures Fixing Spacecraft,” covered his many experiences as both a Physics professor at American University (1968-1984) and problem solver extraordinaire at Goddard for the past 32 years. He discussed highlights from his university research, including computation of the second virial coefficient of water vapor, computation of microwave absorption caused by water dimers, and how intense radar pulses, each heating too little to be judged dangerous to brain tissue, actually supply enough pressure to break down the blood-brain barrier (the same phenomenon as occurs with prize fighters). Well, that kind of background turned out to be the perfect foundation for troubleshooting some of Goddard’s toughest spacecraft problems over the past three decades. One of Dr. Leidecker’s memorable adventures was increasing the lifetime of the Geostationary Operational Environmental Satellite’s incandescent lamps and LEDs from 2 to 15 years. On another occasion, while testing electrical fuses, he discovered that no one had ever studied their behavior numerically across a myriad of physical properties. As he was finishing his analysis, the Hubble Space Telescope (HST) experienced problems with its more than one thousand fuses. Although they passed inspection four times, they were incorrectly wired, bypassing the fuses with 14 gauge copper wire. His expertise was utilized in studying the HST gyros, which have a history of failure and have been replaced twice during servicing missions. HST intended to purchase the same (almost zero failure rate) gyros that were used on the Minute Man program, but unknowingly bought gyros built by a different manufacturer, which had a 10% failure rate, and just discovered this recently. Dr. Leidecker also shared some amazing stories of his experience with the Space Shuttle, including finding and fixing problems with sensors and wires on the turbines, which were causing expensive launch delays. His closing thought was, quoting Einstein, “Nature is subtle, but it is not malicious,” so get behind the physics and you can figure it out. However, he noted, “Einstein never worked as a Failure Analyst. Nature is malicious and will figure out ways to fail that completely outwit all attempts to figure it out on the ground. Only during integration and testing will you really begin to figure it out”.

TREASURER’S REPORT: Treasurer Jackie Gasch received tax-deductible donations from the following members: James Baker, Ronald Barasch, Elaine Blazosky, Ormon Bloxom, Carol Boquist (in memory of William Woodyear), Sandra Brown (in memory of Paul Villone), Ronald Browning, Joyce Buswell, Michael Calabrese, William Case, Jr., Wilma Chigas, JoAnn Clark (in memory of Jacques Knox and David Lewoc), Richard Costa, James Costrell, Edward Danko, Karen Defazio, Carroll Dudley, Denise Duignan, Marlene Forster, Theodore Goldsmith, James Guthrie, Vern Hall, Ellen Herring, Eugene Humphrey, John Kiebler, John Klineberg, Thomas Lavigna, Edward Lawless, Patricia Mackey, Ivan Mason, Michael McCumber, Raymond Melcher, Dillard Menchan, Robert O’Brien, Jr., Carmie Peavler (in memory of Robert Peavler), George Smith (in memory of Virginia Smith and Sebastian Costa), Frank Snow, Richard Strafella, William Struthers, Barbara Sweeney, H. Anne Thompson, Mary Trainor, Roberta Valonis, Vernon Weyers, Lynda Willingham, Robert E. Wilson, and David Zillig.

FROM THE GODDARD ARCHIVES – IT HAPPENED IN FEBRUARY: On February 14, 1980, a Delta rocket launched the Solar Maximum Mission (SMM) satellite from Cape Canaveral, FL. SSM was designed to investigate solar phenomena, particularly solar flares. SMM’s payload consisted of eight instruments that provided broad spectral coverage of radiation produced by solar flares. The High Altitude Observatory provided a coronagraph/polarimeter to study the relationship of the corona to the flare process. The instrument obtained coronal images from March through September before suffering an electronics failure that rendered it inoperative. A few weeks later, a power failure in the Altitude Control System (ACS) of the spacecraft, requiring it to be placed in standby mode, at which it remained for more than three years. On April 6, 1984, the Challenger Space Shuttle was successful in retrieving, repairing/replacing the ACS and the coronagraph’s Main Electronics Box, and redeploying the spacecraft. Atmospheric friction slowly caused the altitude of the spacecraft’s orbit to decline. Consequently, the satellite lost altitude control on November 17, 1989, causing re-entry into the Earth’s atmosphere over the Indian Ocean on December 2, 1989.

THOUGHT FOR FEBRUARY: Beware, because as senior citizens it can be pretty darned scary when we start making the same noises as our coffeemakers or vacuum cleaners.

REMEMBERING OUR FORMER COLLEAGUES: