Is AD 2025-04720 a recurring Airworthiness Directive?

No — AD 2025-04720 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2025-04720

Q: Which aircraft does AD 2025-04720 apply to?

AD 2025-04720 applies to Mhi Rj Aviation Ulc — models CL-600-2B19, 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

AD 2025-04720 · 2025-03-21 · 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 certain MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series 100 and 440), CL-600-2C10 (Regional Jet Series 700, 701, and 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 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). This AD requires installing a new radio frequency (RF) bandpass filter on the coaxial line between the radio altimeter and the receive antenna in the aft equipment compartment. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2025-04720 applies to

MakesMhi Rj Aviation Ulc

ModelsCL-600-2B19, CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-2D24, CL-600-2E25, CL-600

Serial-conditional — narrows to serials 7002–8113, 10002–10999, 10002–10999, 15001–15990, 15001–15990, 19013–19990.

Type Certificate previously held by Bombardier Inc. Applies only to airplanes equipped with a radio altimeter that are not determined to be a radio altimeter tolerant airplane per paragraph (g) of the AD. Serial ranges by model: CL-600-2B19 (RJ100/440) S/N 7002-8113; CL-600-2C10 (RJ700/701/702) S/N 10002-10999; CL-600-2C11 (RJ550) S/N 10002-10999; CL-600-2D15 (RJ705) S/N 15001-15990; CL-600-2D24 (RJ900) S/N 15001-15990; CL-600-2E25 (RJ1000) S/N 19013-19990.

Whether AD 2025-04720 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 2025-04720 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.