Airworthiness directives › 2021-07-10
AD 2021-07-10 Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Applicability*9
This AD applies to MHI RJ Aviation ULC airplanes identified in paragraphs (c)(1) and (2) of this AD, certificated in any category. (1) Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) airplanes and Model CL-600-2C11 (Regional Jet Series 550) airplanes having serial numbers (S/Ns) 10082, 10135, 10141, 10155, 10166, 10173, 10178, 10186, 10249, 10296, and 10327. (2) Model CL-600-2D24 (Regional Jet Series 900) airplanes having S/Ns 15099, 15102, 15144, 15159, 15201, 15212, 15279, 15396, 15409 through 15413 inclusive, 15415, 15419 through 15427 inclusive, 15430, 15449, and 15453.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 8,800 flight hours after the effective date of this AD, inspect for the presence of affected piccolo duct assemblies, as applicable, and replace each affected piccolo duct with a new piccolo duct, as applicable, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-30-025, dated December 17, 2019.
Unsafe condition
This AD was prompted by a report that some piccolo ducts for the wing anti-ice system have bleed holes that do not conform to requirements (such as being undersized, un-burred, or in the wrong location). The FAA is issuing this AD to address non-conforming piccolo duct bleed holes, which could lead to degradation of the wing anti-ice protection of the leading edge of certain slats, and possibly result in airplane handling issues during critical phases of flight.
Affected ADs
None.
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