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Airworthiness Directive 88-21-06

one-time
AD 88-21-06 · 1988-01-01 · turboprop engine

Airworthiness Directives; HEADING: ROLLS-ROYCE plc Models Dart Mks. 506, 510, 511, 514, 525, 526, 527, 528, 529, 531, 532, and 542 Series Engines ACTION: SU

Which aircraft AD 88-21-06 applies to

MakesRolls-Royce Plc
ModelsDart Mk.506, Dart Mk.510, Dart Mk.511, Dart Mk.514, Dart Mk.525, Dart Mk.526, Dart Mk.527, Dart Mk.528, Dart Mk.529, Dart Mk.531, Dart Mk.532, Dart Mk.542, Dart

Applies to all variants of these Dart series turboprop engines; effective November 6, 1988; HP impellers to Mod 844 standard which have accumulated 8,000 or more total flights require action per the schedule specified for Dart Mks. 506, 510, 511, 514, and all variants.

Whether AD 88-21-06 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 88-21-06 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.