night-flying
night-time
nil
nimbostratus
nimbus
no
no-aids
node
no-failure
no-flap
  noise
noise-critical
noise-free
noiseless
noiseproof
noiseworthiness
no-lift
no-load
nominal
nonaffinity
nonassisted

    noise reduction modification

    модификация со сниженным уровнем шума