1、Lessons Learned Entry: 1371Lesson Info:a71 Lesson Number: 1371a71 Lesson Date: 2003-08-04a71 Submitting Organization: JPLa71 Submitted by: David OberhettingerSubject: Shipping Container Susceptibility to ESD Charging (2002) Abstract: Moving and opening a shipping container induced a charge on the su
2、rfaces of the container and onto the attached Mars Exploration Rover equipment module. Even with standard ESD control procedures in place, moving and opening a storage container can unexpectedly induce a charge on flight hardware within it. Five recommendations involve ESD training, ESD inspections,
3、 and container characterization, approval, and labeling.Description of Driving Event: Electrostatic discharge (ESD) arcing occurred during Mars Exploration Rover (MER) integration and test following handling of the Rover Equipment Module (REM) serial number 101. The custom shipping container holding
4、 the REM flight hardware had just been rolled from one room to another for mass properties measurements. A small spark was seen and heard by a technician as he installed a facility ground strap to the REM chassis prior to removing the REM from the container. Subsequent tests verified that moving and
5、 opening the container induced a charge on the surfaces of the container and onto the attached REM chassis. As the facility ground strap was attached, an electrical discharge arced across the gap separating the strap from the REM chassis. The ESD properties of the container were assumed to be accept
6、able. A field potential meter was not used to inspect surfaces of the container prior to attaching the facility ground strap. References 1. JPL Standard for Electrostatic Discharge (ESD) Control (JPL D-1348)2. JPL Problem/Failure Report No. Z77146, August 15, 2002.3. ”Packing and Unpacking ESD Sensi
7、tive Hardware,” JPL Quality Assurance Procedure QAP 61.12, February 26, 2003.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4. JPL Corrective Action Notice No. Z77277, August 27, 2002.5. Lesson Learned No. 1317, “ESD: An Enduring and Insidious Threa
8、t to Flight Hardware (A Cornerstone Lesson),” January 14, 2003.6. Lesson Learned No. 1315, ”Increasing ESD Susceptibility of Integrated Circuits,” December 9, 2002.Additional Key Words: ESD damage, ESD effects, ground handling, ground transportation Lesson(s) Learned: Even with standard ESD control
9、procedures in place, moving and opening a storage container can unexpectedly induce a charge on flight hardware within it.Recommendation(s): 1. Verify each standard and custom container by test and inspection prior to its first and all subsequent uses to determine if it is ESD safe.2. Document proce
10、dures for packing and unpacking ESD-sensitive equipment, emphasizing the need to use a field potential meter and static neutralization methods.3. Prior to removing ESD-sensitive equipment from containers, check for any charge that may have accumulated on the container or equipment, and safely discha
11、rge. Maintenance of the equipment chassis connection to facility ground is mandatory at this point in time.4. The appropriate Center ESD official should approve all purchases of standard and custom containers that may be used to house ESD sensitive flight and ground equipment.5. Place ESD warning la
12、bels on all transport cases, and train personnel for correct procedures when using such containers to transport ESD-sensitive equipment.Evidence of Recurrence Control Effectiveness: Corrective Action Notice No. Z77277 was closed by JPL on September 5, 2003. Measures taken to implement Laboratory-wid
13、e corrective action on the above recommendations were issuing a packing/unpacking procedure, issuing a safety alert, applying ESD warning labels to shipping containers, amending the ESD control standard (JPL D-1348), and providing ESD compliance requirements to JPL Procurement.Documents Related to L
14、esson: NPG 6000.1E “Requirements for Packaging, Handling and Transportation of Electronically Sensitive Equipment and Associated Components.“ 2) NPG 8715.3Mission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a71 Exploration Systems
15、a71 Sciencea71 Space Operationsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Facilitiesa71 Flight Equipmenta71 Ground Equipmenta71 Ground Operationsa71 Hardwarea71 NASA Standardsa71 Packaging Handling Storagea71 Parts Materials & Processesa71 Payloadsa71 Safety & Mission Assurancea71 Test &
16、Verificationa71 Test Articlea71 Test FacilityAdditional Info: Approval Info: a71 Approval Date: 2003-10-15a71 Approval Name: Carol Dumaina71 Approval Organization: JPLa71 Approval Phone Number: 818-354-8242Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
