AK20 means 80% nitric acid + 20% N2O4
AK = Azotna Kislota = Nitric Acid in
NASA
Similar to AK20
AAA - Avionics Air Assembly
AAC - Aft Access Closure
AACB - Aeronautics and Astronautics Coordinating Board
AAD - Attitude Anomaly Detector
AAFE - AeroAssist Flight Experiment
AAFM - Acoustic Atomic Force Microscopy
AAR - After Action Review
View all in NASA