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

Yes — AD 2004-21-01 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

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

AD 2004-21-01 applies to Hartzell Propeller Inc. — models HC-B5MP-3( )/M10282A( )+6, HC-B5MP. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2004-21-01

recurring

Official AD 2004-21-01 · FR doc 04-22728 · 2004-10-14 · propeller

Airworthiness Directives; Hartzell Propeller Inc. (formerly Hartzell Propeller Products Division) Model HC-B5MP-3( )/M10282A( )+6 Five Bladed Propellers

What this AD requires

The FAA is superseding an existing AD for certain Hartzell Propeller Inc. (formerly Hartzell Propeller Products Division) Model HC-B5MP-3( )/M10282A( )+6 five bladed propellers. That AD currently requires initial and repetitive torque check inspections on the attach bolts on certain model Hartzell HC-B5MP-3 five bladed propellers, and replacement of attach bolts if necessary. This AD requires the same inspections, but reduces compliance time for the initial inspection on certain Short Brothers Ltd. Model SD3-30 airplanes to before further flight and within 100 hours time-in-service for propellers installed on certain Aerospatiale (Nord) Model 262A airplanes. This AD also requires repetitive torque check inspections at reduced intervals on SD3-30 airplanes, and requires additional visual inspections of mounting flanges, and threads in hub bolt holes, and replacement of attach bolts and hubs, if necessary. This AD results from four reports in the last 12 months of eleven cracked or failed propeller attach bolts on Short Brothers Model SD3-30 airplanes. We are issuing this AD to prevent propeller separation from 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 2004-21-01 applies to

MakesHartzell Propeller Inc.

ModelsHC-B5MP-3( )/M10282A( )+6, HC-B5MP

Part-conditional — B-3339.

Five-bladed propellers installed on Aerospatiale (Nord) Model 262A airplanes modified by STC SA2369SW, and on Short Brothers Ltd. Model SD3-30 airplanes; concerns propeller attach bolts P/N B-3339.

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