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Airworthiness Directive 61-21-03

one-time
AD 61-21-03 · 1961-01-01 · airframe

Airworthiness Directives; (Reissue No. 1 or later) or FAA approved equivalent, the existing hydraulic quantity gage in the cockpit and the quantity transmit

Which aircraft AD 61-21-03 applies to

MakesDouglas
ModelsDC-8

Hydraulic quantity gage/transmitter modification per Douglas Service Bulletin No. DC-8 A29-40 (applicability read from the AD teaser — confirm exact model/serial from the records.)

Whether AD 61-21-03 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 61-21-03 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.