Is AD 2017-05-51 a recurring Airworthiness Directive?

No — AD 2017-05-51 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2017-05-51 apply to?

AD 2017-05-51 applies to Bell Helicopter Textron Canada — models 429. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2017-05-51

one-time

Official AD 2017-05-51 · FR doc 2017-06710 · 2017-04-10 · airframe

Airworthiness Directives; Bell Helicopter Textron Canada Helicopters

What this AD requires

We are publishing a new airworthiness directive (AD) for Bell Helicopter Textron Canada (Bell) Model 429 helicopters. This AD requires inspecting the condenser blower motor (motor) and condenser blower (blower) to determine if the motor is securely attached to the blower support (shroud). This AD is prompted by a report that the motor detached from the blower. The actions of this AD are intended to prevent an unsafe condition on these products.

Which aircraft AD 2017-05-51 applies to

MakesBell Helicopter Textron Canada

Models429

Part-conditional — 429EC-200, 429EC-202.

Applies only to helicopters with an Air Comm Corporation air conditioning system P/N 429EC-200 or 429EC-202 installed (identifiable by a three-screw installation per Air Comm SB 429-201-1, Rev NC, dated February 17, 2017). Effective April 25, 2017 for all persons except those already subject to Emergency AD 2017-05-51, issued March 3, 2017.

Whether AD 2017-05-51 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 2017-05-51 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.