Is AD 98-21-26 a recurring Airworthiness Directive?

No — AD 98-21-26 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-21-26 apply to?

AD 98-21-26 applies to Mooney — models M20J, M20K, M20M, M20R, M20. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-21-26

one-time

Official AD 98-21-26 · FR doc 98-27330 · 1998-10-15 · airframe

Airworthiness Directives; Mooney Aircraft Corporation Models M20J, M20K, M20M, and M20R Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD) that applies to certain Mooney Aircraft Corporation (Mooney) Models M20J, M20K, M20M, and M20R airplanes. This AD requires grinding the surface of the main landing gear (MLG) leg bracket, inspecting this area for cracks, and replacing any cracked MLG leg bracket. This AD is the result of the manufacturing of several of the MLG leg brackets using laser pattern cutting. The brackets, when manufactured using this process, develop minor cracks at the bends, which could propagate over time. The actions specified by this AD are intended to prevent failure of the MLG side brace bolt caused by cracking of the MLG leg bracket, which could result in MLG collapse with consequent loss of control of the airplane during taxi, takeoff, or landing operations.

Which aircraft AD 98-21-26 applies to

MakesMooney

ModelsM20J, M20K, M20M, M20R, M20

Serial-conditional — narrows to serials 24-3415–24-3416, 25-2018–25-2021, 27-0241–27-0241, 29-0135–29-0138.

M20J: s/n 24-3415 and 24-3416. M20K: s/n 25-2018 through 25-2021. M20M: s/n 27-0241. M20R: s/n 29-0135 through 29-0138.

Whether AD 98-21-26 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 98-21-26 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.