Is AD 99-6101 a recurring Airworthiness Directive?

No — AD 99-6101 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 99-6101 apply to?

AD 99-6101 applies to British Aerospace Hp137 Mk1, Jetstream — models 3201. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-6101

one-time

AD 99-6101 · 1999-03-18 · airframe

Airworthiness Directives; British Aerospace HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD) that applies to all British Aerospace HP137 Mk1, Jetstream series 200, and Jetstream Models 3101 and 3201 airplanes. This AD requires inspecting the elevator bias spring assembly for correct installation and to assure that the correctly manufactured bias spring is installed. This AD also requires replacing any incorrectly manufactured bias spring, reworking any incorrectly installed bias spring assembly, inspecting the link assembly for distortion or damage, and replacing any distorted and/or damaged parts. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the United Kingdom. The actions specified by this AD are intended to prevent failure of the bearings in the elevator down bias spring assembly caused by the installation of an incorrectly manufactured bias spring or damage or distortion to the assembly, which could result in reduced or loss of control of the airplane.

Which aircraft AD 99-6101 applies to

MakesBritish Aerospace Hp137 Mk1, Jetstream

Models3201

applicability derived from the AD summary — confirm the model/serial from the records

Whether AD 99-6101 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 99-6101 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.