Is AD 2021-19-12 a recurring Airworthiness Directive?

No — AD 2021-19-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2021-19-12

Q: Which aircraft does AD 2021-19-12 apply to?

AD 2021-19-12 applies to Mhi Rj Aviation Ulc, Bombardier, Inc. — models CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, CL-600-2E25, CL-600. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2021-19-12 · FR doc 2021-21830 · 2021-10-06 · airframe

Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for MHI RJ Aviation ULC Model CL-600-2C10 (Regional Jet Series 700, 701 & 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 reports and a design review indicating that there could be possible corrosion on the main landing gear (MLG) outer cylinder at the interface with the gland nut on the shock strut installation and on the forward and aft trunnion pins in the MLG dressed shock strut assembly. This AD requires detailed inspections for corrosion on the MLG outer cylinder assemblies, certain MLG dressed shock strut assemblies, and the MLG outer cylinder at the gland nut threads, thread relief groove, and chamfer; a detailed inspection for the presence of corrosion-inhibiting compound (CIC) on the MLG forward and aft trunnion pins and grease adapter assemblies; applicable corrective actions; application of primer, paint, and CIC as applicable; re-identification of certain part numbers; and marking of the MOD STATUS field of the nameplate of certain parts. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-19-12 applies to

MakesMhi Rj Aviation UlcBombardier, Inc.

ModelsCL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, CL-600-2E25, CL-600

Serial-conditional — narrows to serials 10002–?, 15001–?, 19001–?.

Serial number 10002 and subsequent applies to CL-600-2C10 (Regional Jet Series 700, 701 & 702) and CL-600-2C11 (Regional Jet Series 550); S/N 15001 and subsequent applies to CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900); S/N 19001 and subsequent applies to CL-600-2E25 (Regional Jet Series 1000). Type certificate previously held by Bombardier, Inc.

Whether AD 2021-19-12 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 2021-19-12 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.