Is AD 68-17-05 a recurring Airworthiness Directive?

No — AD 68-17-05 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 68-17-05 apply to?

AD 68-17-05 applies to Rolls-Royce — models 506-14, 510-14, 511-8, 511-14. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 68-17-05

one-time

AD 68-17-05 · 1968-01-01 · turboshaft engine

Airworthiness Directives; and 511-14. Compliance required as indicated, unless already accomplished. To prevent or contain a possible failure of the H.P. ce

Which aircraft AD 68-17-05 applies to

MakesRolls-Royce

Models506-14, 510-14, 511-8, 511-14

Part-conditional — EU.29670A, EU.63415A.

To prevent or contain possible failure of the H.P. center section air duct: inspect the high pressure air system center section duct (P/Ns EU.29670A and EU.63415A), particularly adjacent to welds, for cracks (cowling/engine discoloration may indicate a crack), and incorporate a stainless steel wire braid wrap around the duct.

Whether AD 68-17-05 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 68-17-05 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.