AD 2021-23-13

final rule
Data completeness: 80%

Airworthiness Directives; Various Helicopters

AD Number
2021-23-13
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. FAA-2021-0954
FR Citation
86 FR 69992

Applicability

TypeManufacturerModelDetails
aircraft Various Various Airworthiness Directives; Various Helicopters

Unsafe Condition

unsafe condition on these products.

Required Actions

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).

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Before further flight

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Affected Aircraft

All helicopters equipped with a radio (also known as radar) altimeter.

AI-generated summary from the source AD text. Verify against the official source before acting.

Source: Official FAA Source ↗

Retrieved: Apr 4, 2026

Rights: U.S. Government Public Domain

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