Is AD 2013-20-16 a recurring Airworthiness Directive?

Yes — AD 2013-20-16 requires a repetitive inspection every 300 hours. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2013-20-16 apply to?

AD 2013-20-16 applies to Md Helicopters — models MD 900. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2013-20-16

recurring

Official AD 2013-20-16 · FR doc 2013-25702 · 2013-10-31 · airframe

Airworthiness Directives; MD Helicopters, Inc. (MDHI) Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for MDHI Model MD900 helicopters with certain main rotor blade (MRB) retention bolts (bolts) installed. This AD requires a daily check of the position of each bolt, a daily check and a repetitive inspection for a gap in each bolt, and, if necessary, removing and inspecting the bolt for a crack and replacing any cracked bolt with an airworthy bolt. This AD was prompted by multiple reports of in-service bolt failures. The actions are intended to prevent failure of a bolt, which could lead to loss of MRB structural integrity and subsequent loss of control of the helicopter.

Repetitive inspection. Re-inspect every 300 hours. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2013-20-16 applies to

MakesMd Helicopters

ModelsMD 900

Part-conditional — 900R3100001-103, 900R3100001-105.

Applies only to helicopters with main rotor blade retention bolt P/N 900R3100001-103 or 900R3100001-105 installed.

Whether AD 2013-20-16 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 2013-20-16 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.