Is AD 2004-12-07 a recurring Airworthiness Directive?

Yes — AD 2004-12-07 requires a repetitive inspection every 6 months. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2004-12-07 apply to?

AD 2004-12-07 applies to Boeing — models 757. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2004-12-07

recurring

Official AD 2004-12-07 · FR doc 04-13144 · 2004-06-16 · airframe

Airworthiness Directives; Boeing Model 757 Series Airplanes Equipped With Rolls Royce RB211 Engines

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 757 series airplanes equipped with Rolls Royce RB211 engines, that currently requires modification of the nacelle strut and wing structure. This amendment requires, for certain airplanes, repetitive detailed inspections of certain aft bulkhead fasteners for loose or missing fasteners, and corrective action if necessary. For certain other airplanes, this amendment requires a one-time detailed inspection of the middle gusset of the inboard side load fitting for proper alignment and realignment if necessary; a one-time eddy current inspection of certain fastener holes for cracking, and repair if necessary; and a detailed inspection of certain fasteners for loose or missing fasteners; and replacement with new fasteners if necessary. The actions specified by this AD are intended to prevent fatigue cracking in primary strut structure and consequent reduced structural integrity of the strut. These actions are intended to address the identified unsafe condition.

Repetitive inspection. Re-inspect every 6 months. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2004-12-07 applies to

MakesBoeing

Models757

Restates/supersedes AD 99-24-07 requiring modification of the nacelle strut and wing structure per Boeing SB 757-54-0035 (dated July 17, 1997, or Revision 1 dated April 15, 1999, or Revision 2 dated June 13, 2002) to address fatigue cracking in primary strut structure; new requirement adds repetitive detailed inspections of the 20 aft bulkhead fasteners of the lower spar fitting for airplanes not yet modified, with fastener replacement as needed. No specific 757 dash designation is given in this excerpt of the applicability text.

Whether AD 2004-12-07 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 2004-12-07 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.