Airworthiness Directive · Amendment 39-22966 · Navigation
MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier Inc.) Airplanes
This AD applies to the MHI RJ Aviation ULC (Type Certificate previously held by Bombardier Inc.) airplanes identified in paragraphs (c)(1) through (6) of this AD, certificated in any category, that are equipped with a radio altimeter and not determined to be a radio altimeter tolerant airplane as defined in paragraph (g) of this AD.
(1) Model CL-600-2B19 (Regional Jet Series 100 and 440) airplanes, serial number (S/N) 7002 through 8113.
(2) Model CL-600-2C10 (Regional Jet Series 700, 701, and 702) airplanes, S/N 10002 through 10999.
(3) Model CL-600-2C11 (Regional Jet Series 550) airplanes, S/N 10002 through 10999.
(4) Model CL-600-2D15 (Regional Jet Series 705) airplanes, S/N 15001 through 15990.
(5) Model CL-600-2D24 (Regional Jet Series 900) airplanes, S/N 15001 through 15990.
(6) Model CL-600-2E25 (Regional Jet Series 1000) airplanes, S/N 19013 through 19990.
The FAA is adopting a new airworthiness directive (AD) for certain MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series 100 and 440), CL-600-2C10 (Regional Jet Series 700, 701, and 702), CL-600- 2C11 (Regional Jet Series 550), CL-600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet Series 1000) airplanes. This AD was prompted by the 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 installing a new radio frequency (RF) bandpass filter on the coaxial line between the radio altimeter and the receive antenna in the aft equipment compartment. The FAA is issuing this AD to address the unsafe condition on these products.
For purposes of this AD, a “radio altimeter tolerant airplane” is one for which the radio altimeter, as installed, demonstrates the tolerances specified in paragraphs (g)(1) and (2) of this AD, using a method approved by the FAA. No actions are required by this AD for radio altimeter tolerant airplanes.
(1) Tolerance to radio altimeter interference, for the fundamental emissions (3.7-3.98 GHz), at or above the power spectral density (PSD) curve threshold specified in figure 1 to paragraph (g)(1) of this AD.
(2) 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)(2) of this AD.
For Model CL-600-2B19 airplanes: Within 2,300 flight hours or 12 months after the effective date of this AD, whichever occurs first, install a radio frequency (RF) bandpass filter on each radio altimeter in accordance with the applicable parts of the Accomplishment Instructions in MHI RJ Service Bulletin 601R-34-152, Revision E, dated June 29, 2023. Alternatively, airplanes with a dual radio altimeter configuration may comply with this paragraph by installing an RF bandpass filter on one radio altimeter and deactivating the second radio altimeter in accordance with the applicable parts of the Accomplishment Instructions in MHI RJ Service Bulletin 601R-34-152, Revision E, dated June 29, 2023.
For Model CL-600-2C10, CL-600-2C11, CL-600-2D15, and CL-600-2D24 airplanes: Within 2,100 flight hours or 12 months after the effective date of this AD, whichever occurs first, install an RF bandpass filter on each radio altimeter in accordance with the applicable parts of the Accomplishment Instructions in MHI RJ Service Bulletin 670BA-34-054, Revision E, dated January 11, 2024. Alternatively, airplanes with a dual radio altimeter configuration may comply with this paragraph by installing an RF bandpass filter on one radio altimeter and deactivating the second radio altimeter in accordance with the applicable parts of the Accomplishment Instructions in MHI RJ Service Bulletin 670BA-34-054, Revision E, dated January 11, 2024.
For Model CL-600-2E25 airplanes: Before the next flight in the contiguous U.S. airspace after the effective date of this AD, install an RF bandpass filter on each radio altimeter in accordance with the applicable parts of the Accomplishment Instructions in MHI RJ Service Bulletin 670BA-34-054, Revision E, dated January 11, 2024.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
