REG NASA-LLIS-0150-1992 Lessons Learned - Quick Disconnect (QD) Filter Assembly Set (POD) Operations.pdf

1、Lessons Learned Entry: 0150Lesson Info:a71 Lesson Number: 0150a71 Lesson Date: 1992-10-08a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Quick Disconnect (QD)/Filter Assembly Set (POD) Operations Description of Driving Event: The QD/filter assemblies are designed to provid

2、e a disconnect interface and remove all solid particles (exceeding 25 microns) from the servicing fluids at various system operating pressures, contaminant capacities, and rated flows. Servicing fluids include O2, H2, freon, coolant water, and potable water. Assemblies consist of a quick disconnect,

3、 filter, and associated caps, fittings, seals, and tethered nameplate/identification tags. The QD has internal bellows which permit movement of a probe assembly that opens flight-half coupling. A pod component failure may cause contamination in the orbiter onboard reactants.Lesson(s) Learned: Struct

4、ural failure of pod bellows or other assembly components could cause onboard reactants to be contaminated with gaseous helium and particulates.Recommendation(s): Inspect QD/filter assembly set for cleanliness, loose/missing components, pressure loss/leaks, and damage as part of pre-operational check

5、out.Evidence of Recurrence Control Effectiveness: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 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-,-,-