airworthy
An emergency order usually has to do with a security matter or the airworthiness of an aircraft.
High-tech analysis is needed to establish the airworthiness of the planes.
The aircraft’s certificate of airworthiness was suspended.

SMART Vocabulary: related words and phrases

Safe and secure
as safe as housesidiom
biosafety
bite
clear of something
have/lead a sheltered lifeidiom
health and safety
impregnable
impregnably
in safe handsidiom
out of danger
potable
protected
roadworthy
safe
the coast is clearidiom
unassailed
unbruised
unthreatening
untouchable
well kept

You can also find related words, phrases, and synonyms in the topics:

Air travel: aviation