1、Lessons Learned Entry: 0190Lesson Info:a71 Lesson Number: 0190a71 Lesson Date: 1992-10-30a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Launch Complex (LC) 39B Modifications Description of Driving Event: Launch complex 39B demonstrated satisfactory capability during the S
2、TS 51-L launch, with a few exceptions. It was anticipated that the initial shuttle launch from LC 39B would uncover minor problems, and some discrepancies between the Pad A and Pad B systems. Damaged or loosened items due to the launch have been identified as candidates for additional pad “hardening
3、 and other mechanical/electrical systems had minor operating differences than those on LC 39A. A freeze plan was first used during STS 51-L, which allowed vehicle operations to safely continue at below freezing temperatures. The freeze plan was successful in that vehicle operations continued but th
4、e resulting build-up in ice is not considered desirable for future operations. A water systems protection plan, to eliminate the necessity of continuously running water through pipes in very cold weather to prevent freezing inside, is being studied. If operations below freezing temperatures are esse
5、ntial, water system modifications will be required.Lesson(s) Learned: LC 39B systems operate differently than those on LC 39A, making the facilities susceptibile to launch damage.Recommendation(s): Modify pads to operate alike and allow ground support equipment to be connected and used identically a
6、t either facility.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Configuration Managementa71 Facilitiesa71 Ground Operationsa71 HardwareAdditional Info: Approval Info: a71 Approval Date: 1994-06-06a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
