Airworthiness directives › 2021-23-13
AD 2021-23-13 Airworthiness Directives; Various Helicopters
Applicability*9
This AD applies to all helicopters, certificated in any category, equipped with a radio (also known as radar) altimeter. These radio altimeters are installed on various helicopter models including, but not limited to, the helicopters for which the design approval holder is identified in paragraphs (c)(1) through (20) of this AD. (1) Airbus Helicopters (2) Airbus Helicopters Deutschland GmbH (3) Air Space Design and Manufacturing, LLC (4) Bell Textron Canada Limited (5) Bell Textron Inc. (6) Brantly International, Inc. (7) Centerpointe Aerospace Inc. (8) Columbia Helicopters, Inc. (9) The Enstrom Helicopter Corporation (10) Erickson Air-Crane Incorporated, DBA Erickson Air-Crane (11) Helicopteres Guimbal (12) Siam Hiller Holdings, Inc. (13) Kaman Aerospace Corporation (14) Leonardo S.p.a. (15) MD Helicopters Inc. (16) PZL Swidnik S.A. (17) Robinson Helicopter Company (18) Schweizer RSG LLC (19) Scotts-Bell 47 Inc. (20) Sikorsky Aircraft Corporation
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
On or before January 4, 2022: Revise the Limitations Section of the existing RFM for your helicopter by incorporating the limitations specified in figure 1 to paragraph (g) of this AD. This may be done by inserting a copy of this AD into the existing RFM for your helicopter. The action required by this paragraph may be performed by the owner/operator (pilot) holding at least a private pilot certificate and must be entered into the aircraft records showing compliance with this AD in accordance with 14 CFR 43.9(a)(1) through (4) and 14 CFR 91.417(a)(2)(v). The record must be maintained as required by 14 CFR 91.417 or 14 CFR 135.439. ER09DE21.008
Unsafe condition
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). The FAA is issuing this AD because radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground, could lead to loss of continued safe flight and landing.
Affected ADs
None.
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