Airworthiness Directive · Amendment 39-22168 · Wings
MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
This AD applies to MHI RJ Aviation ULC (type certificate previously held by Bombardier, Inc.) Model CL-600-2D24 (Regional Jet Series 900) airplanes, certificated in any category, having serial number 15462 through 15475 inclusive.
The FAA is adopting a new airworthiness directive (AD) for certain MHI RJ Aviation ULC Model CL-600-2D24 (Regional Jet Series 900) airplanes. This AD was prompted by a report of a manufacturing error that can create dents on the lower wing plank, close to the flap arm locations at certain wing stations; as a result, cracks could develop and weaken the structural integrity of the wings before being detected by any existing required inspections. This AD requires an inspection for damage (including dents, cracks, discoloration, gouges, scratches, or other surface damage) of the lower wing plank in the flap arm areas at certain wing stations, and repair if necessary. The FAA is issuing this AD to address the unsafe condition on these products.
Prior to the accumulation of 8,800 total flight hours or within 30 days after the effective date of this AD, whichever occurs later, perform a detailed visual inspection for damage (including dents, cracks, discoloration, gouges, scratches, or other surface damage) of the outer aft lower skin at wing stations (WS) 54.55, WS 128.00, WS 179.00, WS 220.00, and WS 264.00 in accordance with paragraph B., “Procedure,” of the Accomplishment Instructions of MHI RJ Aviation Service Bulletin 670BA-57-029, dated February 2, 2021. Do all applicable corrective actions before further flight. If any damage is found during the inspection, before further flight, repair using a method approved by the Manager, New York ACO Branch, FAA; or Transport Canada Civil Aviation (TCCA); or MHI RJ Aviation ULC's TCCA Design Approval Organization (DAO). If approved by the DAO, the approval must include the DAO-authorized signature.
Although MHI RJ Aviation Service Bulletin 670BA-57-029, dated February 2, 2021, specifies to submit certain information to the manufacturer, this AD does not include that requirement.
