REG NASA-LLIS-3338-2010 Lessons Learned Improve the Constraint System Identification of Precedence Order for Work Procedures.pdf
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1、Public Lessons Learned Entry: 3338Lesson Info:a71 Lesson Number: 3338 a71 Lesson Date: 2010-05-1 a71 Submitting Organization: KSC a71 Submitted by: Annette Pitt Subject: Improve the Constraint System / Identification of Precedence Order for Work Procedures Abstract: Constraints, or the identificatio
2、n of a precedence order for work procedures, are crucial to flight hardware processing. A constraints system has been in place for many years in the Shuttle Program. However, when a new electronic work control system was brought online for Ares I-X processing, a robust and automated way of controlli
3、ng constraints was not provided. As a result, several constraints were missed, and this drove the need to rework constraints, such as opening a closed-out area back up to complete work that was missed. This can even become a safety issue. A system must be put in place when new work control systems a
4、re brought online for the identification of a precedence order for work procedures. Description of Driving Event: Constraints are heavily used in Shuttle processing. A constraint is when one work item must be completed before another can be started. For example, a repair must be completed inside a c
5、avity before the area is closed out for flight. The Space Shuttle electronic work control system automatically identifies constraints, but they are then manually entered onto the work document that needs to be held up. During Ares I-X processing a new electronic work control system, Collaborative In
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