Airworthiness Directive 56-17-03
one-timeAD 56-17-03 · 1956-01-01 · airframe
Airworthiness Directives; hours of operation and each 100 hours flight time thereafter. There have been two reported instances of broken valve tube A-57. Th
Which aircraft AD 56-17-03 applies to
MakesHours Of Operation And Each 100 Hours Flight Time Thereafter There Have Been Two Reported Instances Of Broken Valve Tube A-57 These Failures Were Due To Vibration Of Valve Installed On Downer Rc-3
ModelsRC-3
Whether AD 56-17-03 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 56-17-03 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.
Look up a tail number →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.