1、Lessons Learned Entry: 0035Lesson Info:a71 Lesson Number: 0035a71 Lesson Date: 1992-09-17a71 Submitting Organization: KSCa71 Submitted by: Lisa L.MusgraveSubject: Unprotected NASA Standard Initiators (NSI) Description of Driving Event: NASA standard initiators (NSI) are used to ignite a charge of bo
2、ron potassium nitrate pellets, which begin the solid rocket booster (SRB) ignition sequence. These pellets start a pyrogen igniter and its igniter motor flame starts SRB propellent burning. NSIs can not be protected against inadvertant detonation while in excessive radio frequency fields. The electr
3、omagnetic interference may cause a premature firing of a NSI, possibly resulting in personnel injury/loss of life and damage to flight hardware or ground support equipment.Lesson(s) Learned: NSIs are unprotected against excessive radio frequency (RF) fields during pyrotechnic operations/post-landing
4、 safing and may result in injury/damage.Recommendation(s): Closely monitor pyrotechnic connection, testing, and safing operations, to ensure rf field levels are maintained within safety plan guidelines.Evidence of Recurrence Control Effectiveness: N/AProvided by IHSNot for ResaleNo reproduction or n
5、etworking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): a71 Exploration Systemsa71 Sciencea71 Space Operationsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Energetic Materials - Explosive/Propellant/Pyrotechnica71 Explosives Handlinga71 Flight
6、 Equipmenta71 Ground Operationsa71 Ground Equipmenta71 Hardwarea71 Hazardous/Toxic Waste/Materialsa71 Industrial Operationsa71 Launch Processa71 Launch Vehiclea71 Safety & Mission AssuranceAdditional 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-,-,-
