1、Lessons Learned Entry: 0385Lesson Info:a71 Lesson Number: 0385a71 Lesson Date: 1995-02-21a71 Submitting Organization: JPLa71 Submitted by: R.F. Collins / R.J. WilsonSubject: Hydra-Set* Applications and Hazards Abstract: Lifting incidents with Magellan and the Delta Star instrument show that lifting
2、flight hardware with cranes using hydraulic Hydra-Sets involves potential hazards, including Hydra-Set up pump handle breakage, seal failure and oil leakage. Use only modified hydraulic Hydra-Sets, take protective measures when sensitive or optical surfaces must be exposed to potential Hydra-Set lea
3、kage, and review Hydra-Set handling procedures.Description of Driving Event: For the last several years, JPL has required the use of hydraulic Hydra-Sets when lifting spacecraft flight hardware with cranes. The Hydra-Set is a crane hook mounted device that permits precision raising and lowering, avo
4、iding the shocks and stresses associated with attempting small movement using the crane on/off controls.Recently, two events occurred involving Hydra-Set usage. One involved hydraulic oil leakage onto the Delta Star instrument due to the Hydra-Set up pump handle breaking off internally during an ass
5、embly activity during launch preparations at McDonnell Douglas. The second was with the Magellan Spacecraft during launch preparation at KSC when a Hydra-Set seal burst because of an overload due to using the wrong size Hydra-Set. Fortunately, neither event caused any catastrophic damage.*Hydra-Set
6、is a trademark of Del Mar Avionics Co., Irvine, CA.Lesson(s) Learned: Lifting flight hardware with cranes using hydraulic Hydra-Sets involves potential hazards, including Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Hydra-Set up pump handle breaka
7、ge, seal failure and oil leakage.Recommendation(s): 1. Handling spacecraft flight hardware is potentially hazardous and should be entrusted only to trained and skilled technicians, whether JPL or contractor, who are familiar with the laboratorys established practices and their rationale.2. The Del M
8、ar Avionics company has modified the Hydra-Set design to reduce the probability of up pump handle breakage. Only appropriately modified hydraulic Hydra-Sets should be used.3. When sensitive or optical surfaces must be exposed to potential Hydra-Set leakage, consideration should be given to protectiv
9、e measures.4. Prior to initiation of any assembly or major equipment handling operations; Safety, Quality Assurance and handling procedures should be reviewed to assure that the appropriate cautions and restrictions on the use of Hydra-Sets are included.Evidence of Recurrence Control Effectiveness:
10、N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Lifting Devicesa71 Packaging Handling Storagea71 TransportationAdditional Info: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Approval Info: a71 Approval Date: 1989-04-03a71 Approval Name: Carol Dumaina71 Approval Organization: 125-204a71 Approval Phone Number: 818-354-8242Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
