1、Lessons Learned Entry: 1051Lesson Info:a71 Lesson Number: 1051a71 Lesson Date: 1998-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: Space Shuttle Program/Logistics/Spares Support Description of Driving Event: Line-Replaceable Unit (LRU) Restoration and UpgradingLesson(
2、s) Learned: Support of the Space Shuttle fleet with operational spares has been maintained by the effective efforts of the logistics function. While spares support has been adequate for the current flight rate, any increase in flight rate might not be supportable.Recommendation(s): Although NASA has
3、 established programs for dealing with suppliers and bringing additional component overhaul “in house,“ efforts in these areas need to be continuously reexamined to speed up the restoration and upgrading of line-replaceable units. Such efforts are especially needed to eliminate “dead“ time while uni
4、ts are awaiting restoration. Evidence of Recurrence Control Effectiveness: The Space Shuttle Program concurs with the ASAP concerns for the availability of line replaceable units (LRUs). Logistics monitors LRU spares posture through the probability of sufficiency calculations within the LRU data sys
5、tem. This system can be programmed to determine spares requirements for various flight rates. At this time, an appreciable increase in flight rate would be required to jeopardize supporting the Space Shuttle Program with most of the current LRUs. The Program has been proactive in upgrading LRUs wher
6、e the most pressing fleet support concerns exist. The following upgrades are in progress: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1. The air data transducer assembly is being replaced by the advanced air data transducers.2. The master events
7、controller is being replaced by the advanced master events controller.3. The Global Positioning System is being installed in the orbiters at the orbiter major modification. This could potentially eliminate a number of LRUs in the displays and controls system and tactical air navigation system.4. New
8、 shop replaceable units were purchased to repair the Microwave Scanning Beam Land Station decoders. This decreases turnaround time and increases reliability of the units.5. Solid state recorders are being considered as replacements for the operations and payload recorders. This effort is presently i
9、n the design definition phase.Additionally, through the use of industrial engineering principles and work teams, Logistics has taken action to reduce the NASA Shuttle Logistics Depot (NSLD) backlog and increase output for fiscal year 1998. To date, backlog has decreased 8 percent since October 1 by
10、increasing output. These efforts are aimed at providing better support at the current flight rate but are also the type of efforts that will allow higher flight rates in the future. Documents Related to Lesson: N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phra
11、se(s): a71 Aerospace Safety Advisory Panela71 Logisticsa71 Parts Materials & Processesa71 Policy & Planninga71 Risk Management/Assessmenta71 Safety & Mission AssuranceAdditional Info: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Approval Info: a71 Approval Date: 2001-12-14a71 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-,-,-
