Is AD 2004-01-21 a recurring Airworthiness Directive?

No — AD 2004-01-21 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2004-01-21 apply to?

AD 2004-01-21 applies to Rolls-Royce — models RB211. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2004-01-21

one-time

Official AD 2004-01-21 · FR doc 04-951 · 2004-01-23 · turbine engine

Airworthiness Directives; Rolls-Royce plc (RR) RB211-22B, RB211-524, and RB211-535 Series Turbofan Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce plc (RR) RB211-22B, RB211-524, and RB211-535 series turbofan engines. This AD requires the installation of a front engine mount housing and link support assembly that has a serialized, life limited, spherical bearing installed. This AD results from reports of corrosion and fatigue cracks in the mount pins, the spherical bearings, and the support links and their respective spherical bearings. We are issuing this AD to prevent failure of the front engine mount housing and link support assembly due to cracks that could result in loss of the engine.

Which aircraft AD 2004-01-21 applies to

MakesRolls-Royce

ModelsRB211

Part-conditional — LK83038, LK83047, LK83057, LK83072, LK83110, LK83114, UL10472, UL25694.

Applicability text as sliced is truncated ('applies to each engine identified in the preceding applicability provision'); based on the referenced MSB RB.211-71-D437 and the paragraph (b) exception for RB211-535 engines, this AD concerns Rolls-Royce RB211 series turbofan engines requiring replacement of the front engine mount housing and link support assembly (Table 1 existing-to-reworked P/N mapping) and marking of Module 07 after rework (Table 2), to prevent front engine mount cracking.

Whether AD 2004-01-21 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 2004-01-21 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.