Is AD 99-28248 a recurring Airworthiness Directive?

No — AD 99-28248 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 99-28248 apply to?

AD 99-28248 applies to Saab — models 340B. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-28248

one-time

AD 99-28248 · 1999-11-02 · airframe

Airworthiness Directives; Saab Model SAAB SF340A and 340B Series Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB SF340A and 340B series airplanes, that requires removal of certain main landing gear downlock and brake hydraulic swivel brackets and replacement with new, redesigned brackets. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent failure of the downlock or brake swivels. Brake swivel failure could cause the loss of inboard or outboard brakes. Downlock swivel failure could cause the loss of hydraulic fluid in the main hydraulic system, as well as the loss of nose wheel steering operation, extension and retraction capability of landing gear and flaps, and operation of the propeller brake (if installed).

Which aircraft AD 99-28248 applies to

MakesSaab

Models340B

certain

Whether AD 99-28248 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 99-28248 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.