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Airworthiness Directive 2008-21-06

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Official AD 2008-21-06 · FR doc E8-24130 · 2008-10-16 · airframe

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

What this AD requires

We are adopting a new airworthiness directive (AD) for certain Boeing Model 747-400, 747-400D, and 747-400F series airplanes. This AD requires installing an extension tube to the existing pump discharge port of the scavenge pump on the outboard side of the center fuel tank in the main fuel tank <greek-i>2. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent a fire or explosion in the fuel tank and consequent loss of the airplane.

Which aircraft AD 2008-21-06 applies to

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

Applies to airplanes as identified in Boeing Special Attention Service Bulletin 747-28-2260, dated March 13, 2008.

Whether AD 2008-21-06 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 2008-21-06 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.