Is AD 98-28664 a recurring Airworthiness Directive?

No — AD 98-28664 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-28664 apply to?

AD 98-28664 applies to Mcdonnell Douglas — models C-9. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-28664

one-time

AD 98-28664 · 1998-10-28 · airframe

Airworthiness Directives; McDonnell Douglas Model DC-9-10, -20, - 30, and -40 Series Airplanes; and C-9 (Military) Series Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-10, -20, -30, and - 40 series airplanes; and certain C-9 (military) series airplanes. This amendment requires modifying the piping of the potable water system. This amendment is prompted by reports of ice forming on the control cables in the wheel well of the left main landing gear due to the freezing and rupturing of undrained potable water pipes. The actions specified by this AD are intended to prevent such ice formation, which could render the slat, aileron, and spoiler flight controls inoperative, and consequently could result in reduced controllability of the airplane.

Which aircraft AD 98-28664 applies to

MakesMcdonnell Douglas

ModelsC-9

certain

Whether AD 98-28664 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 98-28664 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.