1、Lessons Learned Entry: 0188Lesson Info:a71 Lesson Number: 0188a71 Lesson Date: 1992-10-29a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: T-0 Umbilical Carrier Plate. Description of Driving Event: As a result of lower release mechanism pin hole elongation, there is potentia
2、l for premature disconnect of the T-0 umbilical carrier plate due to failure of the LO2/LH2 tail service mast (TSM) lower release mechanism pin hole structure to support the dropweight.Lesson(s) Learned: The shock load resulting from shear pin firing causes lower release pin hole elongation, causing
3、 premature T-0 umbilical disconnect.Recommendation(s): Evaluate different design possibilities, i.e., increase the shear pin strength, or holding plate strength.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AProvided by IHSNot for ResaleNo reproduction or networking
4、 permitted without license from IHS-,-,-Mission Directorate(s): N/AAdditional Key Phrase(s): a71 Ground Operationsa71 Ground Equipmenta71 Launch ProcessAdditional 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-,-,-
