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Airworthiness Directive 2011-18-21

recurring
Official AD 2011-18-21 · FR doc 2012-134 · 2012-01-09 · turbine engine

Airworthiness Directives; Rolls-Royce plc (RR) RB211-524 Series Turbofan Engines

What this AD requires

We are superseding an existing airworthiness directive (AD) for the products listed above. That AD currently requires initial and repetitive borescope inspections of the head section and meterpanel assembly of the combustion liner, and replacement if necessary. This new AD requires those same inspections, and replacement. This AD also expands the applicability to include part numbers (P/N) of additional combustion liners. This AD was prompted by an inquiry submitted by an operator, which resulted in RR performing a complete review of the affected front combustion liner part numbers. We are issuing this AD to prevent deterioration of the engine combustion liner, which can result in combustion liner breakup, case burn-through, engine fire, and damage to the airplane.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2011-18-21 applies to

MakesRolls-Royce Plc
ModelsRB211-524B-02, RB211-524B3-02, RB211-524B2, RB211-524B4, RB211-524C2, RB211-524D4, RB211-524G, RB211-524H, RB211-524

Applies to RB211-524B-02 and -524B3-02 engines, and RB211-524B2, -524B4, -524C2, and -524D4 series engines, with a front combustion liner assembly that incorporates RR SB No. RB.211-72-7221 or RR SB No. RB.211-72-7998 but does not incorporate RR SB No. RB.211-72-9670 or RR SB No. RB.211-72-9764; and to RB211-524G and -524H series engines with a front combustion liner assembly that does not incorporate RR SB No. RB.211-72-9764.

Whether AD 2011-18-21 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 2011-18-21 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 →Read the full directive (Federal Register)

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.