Airworthiness Directive · Amendment 39-22399 · Navigation
Bombardier, Inc., Airplanes
Superseded. A later AD replaced this one: AD 2023-14-01. Comply with the one in force.
This AD applies to all Bombardier, Inc., Model BD-700-2A12 airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Bombardier, Inc., Model BD-700-2A12 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), and a recent determination that this interference can result in unavailable or misleading radio altimeter information, adversely affecting the performance of the automatic flight control system (AFCS) and fly-by-wire (FBW) systems and resulting in increased flightcrew workload during takeoff, approach, and landing below 400 feet above ground level (AGL). This AD requires revising the existing airplane flight manual (AFM) with new limitations to mitigate identified hazards due to 5G C-Band interference as identified by Notices to Air Missions (NOTAMs). The FAA is issuing this AD to address the unsafe condition on these products.
Within 30 days after the effective date of this AD, revise Chapter 2—Limitations, Section 8 Systems, C. Automatic Flight Control System, of the existing AFM to include the information specified in figure 1 to paragraph (g) of this AD.
Figure 1 to paragraph (g) — MMEL Restrictions
For airplane serial numbers 70001 through 70110 inclusive and 70112: Within 30 days after the effective date of this AD, revise Chapter 2—Limitations, Section 8 Systems, C. Automatic Flight Control System, of the existing AFM to include the information specified in figure 2 to paragraph (h) of this AD. Using a document with language identical to that of figure 2 to paragraph (h) of this AD is acceptable for compliance with the requirements of this paragraph.
Figure 2 to paragraph (h): AFM Limitations revision
The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, New York ACO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the New York ACO Branch, mail it to ATTN: Program Manager, Continuing Operational Safety, at the address identified in paragraph (j)(2) of this AD or email to: 9-avs-nyaco-cos@faa.gov. If mailing information, also submit information by email. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office.
(2) Previous AMOCs: AMOCs approved for AD 2021-23-12, Amendment 39-21810 (86 FR 69984, December 9, 2021), providing relief for specific radio altimeter installations are approved as AMOCs for the provisions of this AD.
(3) Contacting the Manufacturer: For any requirement in this AD to obtain instructions from a manufacturer, the instructions must be accomplished using a method approved by the Manager, New York ACO Branch, FAA; or Transport Canada; or Bombardier, Inc.'s Transport Canada Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature.
(1) Refer to Transport Canada AD CF-2022-61, dated November 4, 2022, for related information. This Transport Canada AD may be found in the AD docket at regulations.gov under Docket No. FAA-2023-0655.
(2) For more information about this AD, contact William Reisenauer, Aerospace Engineer, Avionics and Electrical Systems Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov.
