1、Lessons Learned Entry: 1068Lesson Info:a71 Lesson Number: 1068a71 Lesson Date: 1999-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: Space Shuttle Program/Logistics/Spares Support Description of Driving Event: Shuttle Spares Support Will Likely Decline With an Increased
2、 Flight RateLesson(s) Learned: While spares support of the Space Shuttle fleet has been generally satisfactory, repair turnaround times (RTATs) have shown indications of rising. Increased flight rates will exacerbate this problem.Recommendation(s): Refocus on adequate acquisition of spares and logis
3、tic system staffing levels to preclude high RTATs, which contribute to poor reliability and could lead to a mishap.Evidence of Recurrence Control Effectiveness: NASA concurs with the recommendation. During calendar year 1998, RTATs for both the NASA Shuttle Logistics Depot and the original equipment
4、 manufacturer fluctuated, but at years end, the overall trend was downward through concerted NASA and vendor efforts. These efforts are aimed at providing better support at the current flight rate and for higher flight rates in the future. Logistics is working to find innovative ways to extend the l
5、ives of aging line replaceable units (LRUs) and their support/test equipment. Logistics has initiated the Space Council (an industry group with 11 other company executives addressing such topics as verification reduction, ISO compliance, and upgrades) to assure the supplier base continues its outsta
6、nding support to the SSP. Examples of LRUs being evaluated and enhanced include: Star Trackers, auxiliary power units, inertial measurement units, multifunction electronic display system (MEDS), Ku-b and, orbiter tires, and manned maneuvering units.Provided by IHSNot for ResaleNo reproduction or net
7、working permitted without license from IHS-,-,-NASA/KSC Logistics and Shuttle Processing Contract (SPC) Integrated Logistics have made progress on a long-term supportability tool. The tool will provide information, including historical repair trend data for major LRUs, RTATs, and “what if“ scenarios
8、 based on manipulation of factors (e.g., flight rate, turnaround times, loss of assets, etc.) to determine their effect on the probability of sufficiency. This will be a tool, not a substitute, for human analytical decision-making.Documents Related to Lesson: N/AMission Directorate(s): a71 Space Ope
9、rationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Aerospace Safety Advisory Panela71 Financial Managementa71 Logisticsa71 Parts Materials & Processesa71 Policy & Planninga71 Risk Management/Assessmenta71 SpacecraftAdditional Info: Approval Info: a71 Approval Date: 2002-01-07a71 Approval Name: Bill Loewya71 Approval Organization: HQa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
