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Airworthiness Directive 2008-10-06

recurring
Official AD 2008-10-06 · FR doc E9-31070 · 2010-01-07 · airframe

Airworthiness Directives; The Boeing Company Model 747-400, -400D, and -400F Series Airplanes

What this AD requires

The FAA is revising an existing airworthiness directive (AD), which applies to certain Model 747-400, -400D, and -400F series airplanes. That AD currently requires revising the FAA-approved maintenance program by incorporating new airworthiness limitations (AWLs) for fuel tank systems to satisfy Special Federal Aviation Regulation No. 88 requirements. That AD also requires phasing in certain repetitive AWL inspections, and repair if necessary. This AD clarifies the intended effect of the AD on spare and on-airplane fuel tank system components. This AD results from a design review of the fuel tank systems. We are issuing this AD to prevent the potential for ignition sources inside fuel tanks caused by latent failures, alterations, repairs, or maintenance actions, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.

Repetitive inspection. Re-inspect every 144 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 2008-10-06 applies to

MakesBoeing
Models747-400, 747-400D, 747-400F, 747

Applies only to airplanes with an original standard airworthiness certificate or original export certificate of airworthiness issued before April 12, 2006 (airplanes certificated on/after that date already complied with these airworthiness limitations as part of certification). AD requires revising operator maintenance documents to add new fuel tank system inspections; AMOC per paragraph (l) if prior modification/repair prevents accomplishing the inspections. Issued from a fuel tank system design review to prevent ignition sources that could cause a fuel tank explosion.

Whether AD 2008-10-06 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 2008-10-06 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.