Is AD 01-13579 a recurring Airworthiness Directive?

No — AD 01-13579 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 01-13579 apply to?

AD 01-13579 applies to Raytheon — models 99, 99A, A99, A99A, B99, C99. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 01-13579

one-time

AD 01-13579 · 2001-06-06 · airframe

Airworthiness Directives; Raytheon Aircraft Company Models 99, 99A, 99A (FACH), A99, A99A, B99, and C99 Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD) that applies to certain Raytheon Aircraft Company (Raytheon) Models 99, 99A, 99A (FACH), A99, A99A, B99, and C99 airplanes. This AD requires you to inspect all main landing gear (MLG) hydraulic actuators to determine the end cap part number that is installed, and replace any actuator that has a part number 4A125C32 end cap. This AD is the result of the potential for fatigue cracks to develop on the MLG hydraulic actuator end caps. The actions specified by this AD are intended to eliminate existing and prevent future fatigue cracks in the MLG hydraulic actuator end caps. Such cracks could cause hydraulic fluid to leak and result in collapse of one or more gears with consequent aircraft damage and passenger injury.

Which aircraft AD 01-13579 applies to

MakesRaytheon

Models99, 99A, A99, A99A, B99, C99

Part-conditional — 4A125C32.

certain

Whether AD 01-13579 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 01-13579 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.