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Airworthiness Directive 56-27-04

one-time
AD 56-27-04 · 1956-01-01 · appliance

Airworthiness Directives; cooling kit and return aircraft to the original Ryan cooling configuration, or 2. Modify the Reading or Hackenberg engine cooling

Which aircraft AD 56-27-04 applies to

MakesRyan

Aircraft fitted with a Reading or Hackenberg aftermarket downdraft engine cooling kit must either (1) remove the cooling kit and return the aircraft to the original Ryan cooling configuration, or (2) modify the Reading or Hackenberg engine cooling kit in accordance with Reading Aviation Service Inc. / Hackenberg Aviation Sales Service instructions.

Whether AD 56-27-04 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 56-27-04 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.