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Airworthiness Directive 86-20-10

one-time
AD 86-20-10 · 1986-01-01 · turboprop engine

Airworthiness Directives; HEADING: ROLLS-ROYCE plc Models Dart Mks., 506, 506F, 510, 510A, 511, 511-7E, 514, 514-7, and 515 Engines ACTION: SUMMARY: DATES:

Which aircraft AD 86-20-10 applies to

MakesRolls-Royce
ModelsDart 506, Dart 506F, Dart 510, Dart 510A, Dart 511, Dart 511-7E, Dart 514, Dart 514-7, Dart 515, Dart

Requires inspection of pressure nozzle guide vane(s) per Rolls-Royce Dart SB Da72-451 Rev 5.

Whether AD 86-20-10 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 86-20-10 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.