1、Lessons Learned Entry: 1002Lesson Info:a71 Lesson Number: 1002a71 Lesson Date: 1997-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: Space Shuttle Program/Orbiter/Avionics Modifications Description of Driving Event: Orbiter Avionics ModificationsLesson(s) Learned: The S
2、pace Shuttle is about to receive two major avionics upgrades-a triple redundant Global Positioning System (GPS) installation and the Multi-Function Electronic Display System (MEDS)-both of which require significant changes to the Primary Flight Software (PFS) and Backup Flight Software (BFS) systems
3、.Recommendation(s): The Space Shuttle program should ensure that both the GPS and MEDS software changes are thoroughly tested in the Shuttle Avionics Integration Laboratory (SAIL) using the normal and enhanced test protocols that have proved to be robust when testing major modifications.Evidence of
4、Recurrence Control Effectiveness: The SSP concurs that all software and hardware changes need thorough testing, and it recognizes the extremely important role that SAIL testing fulfills in the complement of testing for software certification. All Shuttle software or hardware upgrades are assessed to
5、 determine integrated verification test requirements. The SSP and its contractors cooperate to produce integrated hardware and software test implementation plans, test requirements documents, and integrated test schedules to assure that the required resources, including SAIL, are available. All thes
6、e plans are reviewed and approved by the program. Thorough testing of each new capability is then performed and analyzed. This same rigorous process that is used for flight software Operational Increment (OI) updates will Provided by IHSNot for ResaleNo reproduction or networking permitted without l
7、icense from IHS-,-,-be applied to the MEDS, GPS, other Shuttle upgrades, and future software updates.Documents Related to Lesson: N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Aerospace Safety Advisory Panela71 Computersa71 Human Factorsa71 SoftwareAdditional Info: Approval Info: a71 Approval Date: 2001-11-01a71 Approval Name: Bill Loewya71 Approval Organization: QSa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
