Engineering topics

Lewis, John

Publications and source records attributed to Lewis, John.

21 records · Page 2

NASA NTRS2004

International Space Station (ISS) Metal Oxide (MetOx) Odor Anomaly

On occasion, seemingly normal operations can have significant effects upon the closed environment of the International Space Station (ISS). An example of such a case occurred on February 20, 2002 when a nominal Metal Oxide (MetOx) canister regeneration operation onboard the ISS resulted in an unexpected, foul odor that affected the crew and station operations. A case study summarizing the root cause for the event and steps taken to ensure that future MetOx regeneration operations proceed safely is presented. Included in the summary are engineering analyses and environmental monitoring results supporting the root cause assessment as well as testing conducted and flight operations changes implemented to ensure safe operations.

Prokhorov, Kimberlee↗

NASA NTRS2000

Development of a Solid Chlorate Backup Oxygen Delivery System for the International Space Station

The International Space Station (ISS) Program requires that there always be a 45 calendar day contingency supply of breathing oxygen. In the early assembly stages, there is only one flight system, the Russian Solid Fuel Oxygen Generator (SFOG), that can meet that requirement. To better ensure the contingency oxygen supply, the Crew and Thermal Systems Division was directed to develop a flight hardware system that can meet all contingency oxygen requirements for ISS. Such a system, called the Backup Oxygen Candle System (BOCS), has been built and tested. The BOCS consists of 33 chlorate candles, a thermal containment apparatus, support equipment and packaging. The thermal containment apparatus utilizes the O2 produced by the candle as the motive stream in an ejector to passively cool the candle during operation.

Graf, John↗

NASA NTRS1997

The Second Generation High Speed Rotor Head Mounted Instrumentation System

NASA Ames Research Center has been investigating the air pressure flow of a rotor blade on a UH-60 Black Hawk helicopter in-flight. This paper will address the changes and improvements due to additional restrictions and requirements for the instrumentation system. The second generation instrumentation system was substantially larger and this allowed greatly improved accessibility to the components for ease of maintenance as well as improved gain and offset adjustment capabilities and better filtering.

Lewis, John↗