Airworthiness directives › 2023-11-07
AD 2023-11-07 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
(1) For purposes of this AD, a “radio altimeter tolerant rotorcraft” is one for which the radio altimeter, as installed, demonstrates the tolerances specified in paragraphs (g)(1)(i) and (ii) of this AD, using a method approved by the FAA. No actions are required by this AD for radio altimeter tolerant rotorcraft. (i) Tolerance to radio altimeter interference, for the fundamental emissions (3.7-3.8 GHz), at or above the power spectral density (PSD) curve threshold specified in figure 1 to paragraph (g)(1)(i) of this AD. Figure 1 to paragraph (g)(1)(i)— Fundamental Effective Isotropic PSD at Outside Interface of Rotorcraft Antenna BILLING CODE 4910-13-P ER22JN23.005 (ii) Tolerance to radio altimeter interference, for the spurious emissions (4.2-4.4 GHz), at or above the PSD curve threshold specified in figure 2 to paragraph (g)(1)(ii) of this AD. Figure 2 to paragraph (g)(1)(ii): Spurious Effective Isotropic PSD at Outside Interface of Rotorcraft Antenna ER22JN23.006 (2) For purposes of this AD, a “non-radio altimeter tolerant rotorcraft” is one for which the radio altimeter, as installed, does not demonstrate the tolerances specified in paragraphs (g)(1)(i) and (ii) of this AD.
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
This AD replaces AD 2021-23-13, Amendment 39-21811 (86 FR 69992, December 9, 2021) (AD 2021-23-13).
Read the original on the Federal Register →
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