C.F.R. » Title 14 » CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER C—AIRCRAFT › PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES › Subpart F—Equipment

14 C.F.R. § 25.1449

Means for determining use of oxygen

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There must be a means to allow the crew to determine whether oxygen is being delivered to the dispensing equipment.