1、Lessons Learned Entry: 0108Lesson Info:a71 Lesson Number: 0108a71 Lesson Date: 1992-08-20a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Gaseous Helium Injection During Slow LOX Fill Description of Driving Event: The helium injection system introduces a controlled flow of
2、helium into the aft end of the feedline to prevent geysers during propellant loading and holds before launch. The helium is supplied from panel S72-0697-08 through one series valve (A78410) and two parallel valves. Failure of the series valve or clogging of the downstream filter could cause loss of
3、bubbling. Loss of helium bubbling prior to 2% full or after 98% full in the external tank (ET) could result in damage due to geysering.Lesson(s) Learned: Failure of the helium injection valve or clogging of the filter could cause loss of the helium injection system.Recommendation(s): Develop a preve
4、ntative maintenance program for the critical valves and filters in this system.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a71 Space Operatio
5、nsa71 Exploration SystemsAdditional Key Phrase(s): a71 Ground Operationsa71 Ground Equipmenta71 Launch Processa71 Launch VehicleAdditional Info: Approval Info: a71 Approval Date: 1994-06-02a71 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-,-,-
