1、Lessons Learned Entry: 0084Lesson Info:a71 Lesson Number: 0084a71 Lesson Date: 1992-06-09a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Environmental Control System (ECS) Purge of Orbiter Compartments Description of Driving Event: The OPF environmental control system (ECS
2、) supplies conditioned air through ducts to the orbiter to purge and pressurize the forward/aft compartments and the payload bay. Over-pressurization could occur during ECS purge if the ventdoors are closed. No automatic monitoring and/or control exists to preclude simultaneous application of ECS pu
3、rge air while all orbiter vent doors are closed, or to automatically relieve excess pressure under these circumstances.Lesson(s) Learned: Inadvertent closure of the vent doors during environmental control system (ECS) purge of orbiter compartments will result in over-pressurization.Recommendation(s)
4、 Require aproprieate operations instructions to verify that all orbiter vent doors are in the standard purge configuration prior to start of venting.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted wit
5、hout license from IHS-,-,-N/AMission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Flight Operationsa71 Flight Equipmenta71 Launch Processa71 Launch Vehiclea71 Pressure VesselsAdditional 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-,-,-
