Airworthiness Directive · Amendment 39-22660 · Landing gear
Bombardier, Inc., Airplanes
This AD applies to all Bombardier, Inc., Model BD-100-1A10 airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by a report of a steering control unit (SCU) filter plate connector that does not meet the certification requirements for exposure of electronic components to high intensity radiated field environments, which could result in malfunction of the nose wheel steering (NWS) system. This AD requires determining if the SCU is an affected SCU, replacing all affected SCUs, and rigging and testing the NWS control. This AD also prohibits installing an affected SCU on any airplane. The FAA is issuing this AD to address the unsafe condition on these products.
Within 24 months after the effective date of this AD: Inspect the SCU to determine if SCU part number (P/N) 46000-01 with a serial number listed in Figure 1 to paragraph (g) of this AD is installed on the airplane. A review of the airplane maintenance records is acceptable in lieu of the inspection if the SCU P/N and serial number can be conclusively determined from that review. If an SCU P/N 46000-01 with a serial number listed in Figure 1 to paragraph (g) of this AD is not installed on the airplane, or if the SCU identification plate is marked with SB100-32-030, then no further action is required by this AD; however, the installation prohibition in paragraph (i) of this AD still applies.
For airplanes with SCU P/N 46000-01 with a serial number listed in Figure 1 to paragraph (g) of this AD installed and not marked on the SCU identification plate with SB100-32-030: Within 24 months after the effective date of this AD, replace the SCU and rig and test the NWS control, in accordance with the instructions in paragraph (h)(1), (2), or (3) of this AD, as applicable.
(1) For airplane serial numbers 20001 through 20500 inclusive: Steps 2.C.(1) and 2.C.(3) of Section 2.C., “Part B—Modification,” and Section 2.D., “Testing,” of the Accomplishment Instructions in Bombardier Service Bulletin 100-32-34, dated October 18, 2021.
(2) For airplane serial numbers 20501 through 20893 inclusive: Steps 2.C.(1) and 2.C.(3) of Section 2.C., “Part B—Modification,” and Section 2.D., “Testing,” of the Accomplishment Instructions in Bombardier Service Bulletin 350-32-010, dated October 18, 2021.
(3) For airplane serial numbers 20894 and larger: A method approved by the Manager, International Validation 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.
