Is AD 98-26974 a recurring Airworthiness Directive?

No — AD 98-26974 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-26974 apply to?

AD 98-26974 applies to Twin Commander — models 500, 680, 690, 695. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-26974

one-time

AD 98-26974 · 1998-10-09 · airframe

Airworthiness Directives; Twin Commander Aircraft Corporation 500, 680, 690, and 695 Series Airplanes

What this AD requires

This amendment revises Airworthiness Directive (AD) 98-08-25, which currently requires replacing the nose landing gear (NLG) drag link bolt with an approved heat-treated bolt that has the manufacturer's serial number, manufacture date, and the last three digits of the drawing number (055) on the bolt head on certain Twin Commander Aircraft Corporation (Twin Commander) 500, 680, 690, and 695 series airplanes; and changing the bolt part number (P/N) to be installed on Models 690D and 695A from P/N ED10055 to P/N 750076-1. The FAA inadvertently transposed the serial numbers of the 4 affected Model 695A airplanes. This AD retains the same actions of AD 98-08-25, and corrects the serial numbers of these 4 airplanes. Three of the four airplanes are not on the U.S. Register and the other one is already in compliance with the actions of AD 98-08-25. The actions specified in this AD are intended to continue to prevent the NLG from collapsing due to failure of a drag link bolt, which could result in loss of control of the airplane during landing operations.

Which aircraft AD 98-26974 applies to

MakesTwin Commander

Models500, 680, 690, 695

Part-conditional — 750076-1.

certain

Whether AD 98-26974 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 98-26974 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.