Operations risk management: managing your integration and test risk
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risk management safety survey systems safety↗
Engineering topics
Lumsden, J. M.
Publications and source records attributed to Lumsden, J. M..
Operations risk management: managing your integration and test risk
talks about how the risk of damage to program hardware during the assembly, integration, and test activities prior to a project's operational phase is significant.
systems safety↗
Purging sensitive science instruments with nitrogen in the STS environment
Potential contamination of extremely sensitive science instruments during prelaunch, launch, and earth orbit operations are a major concern to the Galileo and International Solar Polar Mission (ISPM) Programs. The Galileo Program is developing a system to purify Shuttle supplied nitrogen gas for in-flight purging of seven imaging and non-imaging science instruments. Monolayers of contamination deposited on critical surfaces can degrade some instrument sensitivities as much as fifty percent. The purging system provides a reliable supply of filtered and fried nitrogen gas during these critical phases of the mission when the contamination potential is highest. The Galileo and ISPM Programs are including the system as Airborne Support Equipment (ASE).
Lumsden, J. M.↗
Automatic arc welding of propulsion system tubing in close proximity to sensitive electronic devices
The planned final assembly of the Galileo spacecraft propulsion system tubing, which involves welding in close proximity to sensitive electronics, raised significant concerns about the effects of electromagnetic coupling of weld energy on CMOS and other sensitive integrated circuits. A test program was established to assess the potential of an orbital arc welder and an RF-induction brazing machine to damage sensitive electronic equipment. Test parameters were varied to assess the effectiveness of typical transient suppression practices such as grounding, bonding, and shielding. A technique was developed to calibrate the hazard levels at the victim-circuit location; this technique is described along with the results and conclusions of the test program.
Lumsden, J. M.↗