REG NASA-LLIS-0022-1991 Lessons Learned - Emergency Equipment Design to Preclude Failures (Shuttle Crew Equipment Flotation Bladder) due to Abrasive Zippers.pdf

1、Lessons Learned Entry: 0022Lesson Info:a71 Lesson Number: 0022a71 Lesson Date: 1991-08-29a71 Submitting Organization: JSCa71 Submitted by: Leroy UnderwoodSubject: Emergency Equipment Design to Preclude Failures (Shuttle Crew Equipment Flotation Bladder) due to Abrasive Zippers Description of Driving

2、 Event: A bladder on a shuttle crew emergency rescue equipment inflatable flotation assembly was abraded by the zipper on the flotation sleeve, causing it to leak. Three of the flotation assemblies were flown on the orbiter for two flights and used twice in training sequences, which resulted in the

3、zippers wearing and cutting the bladder where it passes around an emergency oxygen bottle. The corrective action taken was to add a zipper guard flap to all existing sleeves and to units to be manufactured.Lesson(s) Learned: The sharp edges of zippers bearing against adjacent materials can wear and

4、penetrate the materials, resulting in potentially critical failures (shuttle orbiter crew emergency flotation assembly bladder).Recommendation(s): A zipper protective flap was added along the entire length of the zipper.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/

5、AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Mission Directorate(s): a71 Exploration Systemsa71 Space Operationsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Emergency Preparednessa71 Flight Operationsa71 Flight Equipmenta71 Hardwarea71 L

6、aunch Vehiclea71 Parts Materials & Processesa71 Personal Protective Equipmenta71 SpacecraftAdditional Info: Approval Info: a71 Approval Date: 1993-09-10a71 Approval Name: Ron Montaguea71 Approval Organization: JSC/NS3a71 Approval Phone Number: 281-483-8576Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-