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Airworthiness Directive 2021-23-13

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Official AD 2021-23-13 · FR doc 2021-26779 · 2021-12-09 · airframe

Airworthiness Directives; Various Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for all helicopters equipped with a radio (also known as radar) altimeter. This AD was prompted by a determination that radio altimeters cannot be relied upon to perform their intended function if they experience interference from wireless broadband operations in the 3.7-3.98 GHz frequency band (5G C-Band). This AD requires revising the limitations section of the existing rotorcraft flight manual (RFM) for your helicopter to incorporate limitations prohibiting certain operations requiring radio altimeter data when in the presence of 5G C-Band interference in areas as identified by Notices to Air Missions (NOTAMs). The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-23-13 applies to

MakesAirbus HelicoptersAirbus Helicopters Deutschland GmbhAir Space Design And Manufacturing, LlcBell Textron Canada LimitedBell Textron Inc.Brantly International, Inc.Centerpointe Aerospace Inc.Columbia Helicopters, Inc.The Enstrom Helicopter CorporationErickson Air-Crane Incorporated, Dba Erickson Air-CraneHelicopteres GuimbalSiam Hiller Holdings, Inc.Kaman Aerospace CorporationLeonardo S.P.A.Md Helicopters Inc.Pzl Swidnik S.A.Robinson Helicopter CompanySchweizer Rsg LlcScotts-Bell 47 Inc.Sikorsky Aircraft Corporation
Applies to all models of the make above.

Applies to all helicopters, certificated in any category, equipped with a radio (radar) altimeter, regardless of model; design approval holders include but are not limited to the 20 listed manufacturers.

Whether AD 2021-23-13 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 2021-23-13 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.