1、Lessons Learned Entry: 0023Lesson Info:a71 Lesson Number: 0023a71 Lesson Date: 1992-09-04a71 Submitting Organization: KSCa71 Submitted by: Lisa L.MusgraveSubject: Payload Canister Manual Flow Control Valve Description of Driving Event: The payload canister consists of a canister shell and two cargo
2、bay doors driven by air motors. The cargo bay door operations are controlled by a flow control valve with three positions (open, neutral, closed). If the door speed control valve is in the open or closed posititon and the flow valve is inadvertently moved out of neutral, the cargo bay doors will ope
3、n or close. Unscheduled operation of the payload canister doors could result in personnel injury or damage to a payload or canister door.Lesson(s) Learned: Moving the flow control valve from neutral while payload door speed control valve is in open/closed position may damage payload or canister door
4、Recommendation(s): Install locking device on the flow control valve to hold neutral position until door speed valve is fully closed/locked upon desired door position.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or network
5、ing permitted without license from IHS-,-,-N/AMission Directorate(s): a71 Exploration Systemsa71 Sciencea71 Space Operationsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Flight Operationsa71 Flight Equipmenta71 Hardwarea71 Launch Vehiclea71 Parts Materials & Processesa71 SpacecraftAdditional Info: Approval Info: a71 Approval Date: 1994-06-01a71 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-,-,-
