REG NASA-LLIS-2037-2010 Lessons Learned - Inadvertently Excessed Pulse Width Modulator Circuit Card Assemblies (PWM CCA).pdf
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1、Lessons Learned Entry: 2037Lessons Learned Entry: 2037Lesson Info:a71 Lesson Number: 2037a71 Submitting Organization: KSCa71 Submitted by: Michael Bella71 POC Name: Michael Dodsona71 POC Email: michael.dodsonnasa.gova71 POC Phone: 321.867.1348Subject: Inadvertently Excessed Pulse Width Modulator Cir
2、cuit Card Assemblies (PWM CCA) Abstract: Pulse width modulator circuit card assemblies (PWM CCAs), valued at $150,000 each were inadvertently excessed to the KSC excess property storage area. The PWM CCAs were attached to holding fixtures, and were subsequently purchased as scrap metal by a local sa
3、lvage company. The sole decision criterion for excessing items was usage rate. The computerized logistics system documented the holding fixtures as not being in use. The individuals involved in the excessing process believed that they were only excessing holding fixtures. The holding fixtures were e
4、ntered as separate items from the PWM CCAs, because the system lacked the capability to document and track integrated components. Programs should identify risks for disposition and excess of hardware, by analyzing all process flows, permit entry and designation of integrated hardware and train mater
5、ial handling personnel by management covering flight hardware handling and identification.Description of Driving Event: On April 12, 2006 six pulse width modulator circuit card assemblies (PWM CCAs), valued at $150,000 each were inadvertently excessed by the International Space Station program to th
6、e KSC excess property storage area. The PWM CCAs were attached to holding fixtures, and were spares for the ISS battery charge discharge unit. The PWM CCAs and their holding fixtures were subsequently purchased as scrap metal by a local salvage company. The PWM CCAs and holding fixtures were exposed
7、 to the weather at the KSC excess property storage area and in the salvage companys outside storage yard for approximately 11 months. The holding fixtures and not the attached PWM CCAs were identified and processed as excess equipment. The PWM CCAs were flight hardware and remained undetected throug
8、hout the entire excessing process. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Lessons Learned Entry: 2037On August 9, 2006, the fixtures and PWM CCAs were sold at an auction as part of a miscellaneous lot to a local salvage company. On January 1
9、1, 2007, the Contractor conducted an inventory of items worth $100K or more that revealed the six PWM CCAs were missing. After research and analysis by the Contractor, the PWM CCAs were located, re-purchased and retrieved from the salvage yard on March 9, 2007. After being excessed and stored outsid
10、e for several months, the PWM CCAs were no longer flight worthy resulting in a loss of $900,000. The mishap was classified as a Type B. Lesson(s) Learned: The sole decision criterion for excessing items was usage rate. The computerized logistics system documented the holding fixtures as not being in
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