Is AD 98-08-20 a recurring Airworthiness Directive?

No — AD 98-08-20 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-08-20 apply to?

AD 98-08-20 applies to Alliedsignal. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-08-20

one-time

Official AD 98-08-20 · FR doc 98-10053 · 1998-04-17 · appliance

Airworthiness Directives; AlliedSignal Aerospace Bendix/King Model KSA 470 Autopilot Servo Actuators, Part Numbers 065-0076-10 Through 065-0076-15

What this AD requires

This amendment adopts a new airworthiness directive (AD) that applies to certain AlliedSignal Aerospace Bendix/King Model KSA 470 autopilot servo actuators, part numbers 065-0076-10 through 065-0076- 15, that are installed on aircraft. This AD requires replacing the autopilot servo actuator with a modified actuator. This is the result of two reports of the affected autopilot servo actuators containing loose roll pins within the servo housing. Loose roll pins could fall out, become lodged in the output shaft clutch mechanism, and prevent this mechanism from disengaging. The actions specified by this AD are intended to prevent such an occurrence, which could result in increased effort by the pilot to control the aircraft and possible loss of control of the affected flight control axis.

Which aircraft AD 98-08-20 applies to

MakesAlliedsignal

Applies only to airplanes that have one of the affected autopilot servo actuators installed (not incorporating Mod 3). Requires replacement with an actuator incorporating Mod 3, which changes the size of the servo actuator roll pin holes so the pins do not become loose and fall out; effective June 2, 1998.

Whether AD 98-08-20 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 98-08-20 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.