REG NASA-LLIS-0035-1992 Lessons Learned - Unprotected NASA Standard Initiators (NSI).pdf
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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
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