Is AD 2012-17-13 a recurring Airworthiness Directive?

Yes — AD 2012-17-13 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2012-17-13 apply to?

AD 2012-17-13 applies to Boeing — models 707-100, 707-100B, 707-200, 707-300, 707-300B, 707-300C, 707-400, 720. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2012-17-13

recurring

Official AD 2012-17-13 · FR doc 2012-21533 · 2012-09-11 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 707-100 long body, -200, -100B long body, and -100B short body series airplanes; Model 707-300, -300B, -300C, and - 400 series airplanes; and Model 720 and 720B series airplanes. This AD was prompted by reports of stress corrosion cracking in the chord segments made from 7079 aluminum in the horizontal stabilizer rear spar, and potential early fatigue cracking in the chord segments made from 7075 aluminum. For certain airplanes, this AD requires using redefined flight cycle counts, determining the type of material of the horizontal stabilizer, rear spar, and upper and lower chords on the inboard and outboard ends of the rear spar; repetitively inspecting for cracking of the horizontal stabilizer components; and repairing or replacing the chord, or modifying chord segments made from 7079 aluminum, if necessary. For all airplanes, this AD requires inspecting certain structurally significant items, and repairing discrepancies if necessary. We are issuing this AD to detect and correct stress corrosion and/or potential early fatigue cracking in the horizontal stabilizer, which could compromise the structural integrity of the stabilizer.

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 2012-17-13 applies to

MakesBoeing

Models707-100, 707-100B, 707-200, 707-300, 707-300B, 707-300C, 707-400, 720, 720B, 707

707-100 and 707-100B include long-body and short-body variants (707-100 long body; 707-100B long body and short body). Applicability further identified in Boeing 707 Alert Service Bulletin A3515, dated December 19, 2007, and Alert Service Bulletin A3516, dated April 4, 2008.

Whether AD 2012-17-13 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 2012-17-13 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.