NNI-I means NASA Standard Initiator-Type I was SMSI in NASA
Similar to NNI-I
ACCMS - Advanced Checkout, Control, and Maintenance SystemACCS - Advanced Checkout and Control System
ACE - Advanced Composition Explorer
ACE - Apollo Checkout Equipment
ACES - Acoustic Containerless Experiment System
ACF - Auto- Correlation Function
ACFS - Advanced Concepts Flight Simulator
View all in NASA