Is AD 2004-13-05 a recurring Airworthiness Directive?

No — AD 2004-13-05 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2004-13-05 apply to?

AD 2004-13-05 applies to Mbb — models BK117A-1, BK117A-3, BK117A-4, BK117B-1, BK117B-2, BK117C-1, BK117. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2004-13-05

one-time

Official AD 2004-13-05 · FR doc 04-14318 · 2004-06-25 · airframe

Airworthiness Directives; Eurocopter Deutschland Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) for the specified Eurocopter Deutschland (ECD) model helicopters that requires inspecting the vertical fin skin paneling to determine if it was manufactured with the correct wall thickness. This amendment is prompted by a report from the manufacturer that some vertical fins may have been produced with the wrong vertical fin skin thickness. The actions specified by this AD are intended to prevent failure of the vertical fin and subsequent loss of control of the helicopter.

Which aircraft AD 2004-13-05 applies to

MakesMbb

ModelsBK117A-1, BK117A-3, BK117A-4, BK117B-1, BK117B-2, BK117C-1, BK117

Serial-conditional — narrows to serials 7500–7545.

A-1, A-3, A-4, B-1, and B-2 variants apply to all serial numbers; the C-1 variant applies only to S/N 7500 through 7545.

Whether AD 2004-13-05 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 2004-13-05 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.