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Airworthiness Directive 99-30517

one-time
AD 99-30517 · 1999-11-26 · airframe

Airworthiness Directives; Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes; and Model 727-100 and -200 Series Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 737-100, -200, -300, -400, and -500 series airplanes; and Model 727-100 and -200 series airplanes. This amendment requires a one-time inspection to determine the presence and condition of the breather plug in each fuel tank boost pump; and either installation of a new plug or replacement of the boost pump with a new or serviceable pump, if necessary. This amendment is prompted by a report that breather plugs were missing from fuel tank boost pumps. The actions specified by this AD are intended to prevent possible ignition of fuel vapor in the fuel tank boost pump, which could result in a fuel tank explosion in the event of a boost pump internal failure.

Which aircraft AD 99-30517 applies to

MakesBoeing
Models727-100

certain

Whether AD 99-30517 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 99-30517 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.