Not the official record. The text is the Federal Register's, laid out for reading, and for older ADs the FAA's own index; the original linked on each AD is the legal version, and the FAA's DRS shows the current revision.

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AerScheduler

Schedule aircraft, manage your team, and keep billing square on the web and in native iOS and Android apps.

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April 1921

ADs published in April 1921

0 Airworthiness Directives.

March 1921 May 1921

Not the official record. The text is the Federal Register's, laid out for reading, and for older ADs the FAA's own index; the original linked on each AD is the legal version, and the FAA's DRS shows the current revision.