On large aircraft, braked wheel assemblies are normally inflated with
- nitrogen.
- nitrogen and not more than 5% of air.
- an argon and CO2 mixture.
Explanation from PART66Online
Tyres on braked wheels are charged with an inert gas whose oxygen content must not exceed 5 per cent by volume, so the answer naming that limit is the correct one. Bare nitrogen understates the requirement, and an argon and carbon dioxide mixture is not the servicing medium used.
A
Afshinarabi asked · 21 Jun 2026
ONE ANSWER IS ONLY NITROGEN AND ANOTHER SAYS
nitrogen and not more than 5% of air. WHICH ONE IS CORRECT?
Community Comments (1)
A
AnyaK
21 Jun 2026
Because ATA 32 braked wheels must stay low on oxygen so the hot tyre liner does not gas off and ignite, answer is plain nitrogen. The certification limit is 5 percent oxygen by volume, not 5 percent air, so that second option is just a worded-up distractor.
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