Air Lawhard#72
The ICAO noise certification standard categorizes aircraft into:
A
Levels 1-3
B
Classes I-V
C
Grades A-F
D
Chapters (1, 2, 3, 4, 14)
CorrectExplanation
Aircraft are noise-certified under Chapters defined in Annex 16, Volume I. Modern aircraft must meet Chapter 14 (most stringent) or Chapter 4 standards.
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