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Airworthiness Directive 74-24-13

one-time
AD 74-24-13 · 1974-01-01 · appliance

Airworthiness Directives; ( ) (Serial Numbers 70,000 thru 102,000, A1 thru A9999, B1 thru B9999, and C1 thru C2860) altimeters installed on various aircraft

Which aircraft AD 74-24-13 applies to

MakesUnited Instruments
Serial-conditional — narrows to serials 70,000–102,000, A1–A9999, B1–B9999, C1–C2860.
Part-conditional — 5932.

applies to United Instruments P/N 5932 altimeters, serial numbers 70,000-102,000 (and A/B/C series), installed across multiple aircraft makes per the teaser; confirm exact aircraft model from the records

Whether AD 74-24-13 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 74-24-13 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

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Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.